Jewelry and its manufacturing method

Abstract

To provide a jewelry item, the pattern of which can be enjoyed as it changes with long-term use, and a manufacturing method for the jewelry item. [Solution] One aspect of the present invention is a jewelry 1 comprising a metal base part 10 having a first surface 10a and a second surface 10b opposite the first surface 10a, where the direction connecting the first surface 10a and the second surface 10b is the thickness direction, and the metal base part 10 has, in the thickness direction, a first region 11 proximal to the first surface 10a and a second region 12 proximal to the second surface 10b than the first region 11, and the first region 11 includes a first pattern P1, and the second region 12 is arranged at a position overlapping the first pattern P1 in the thickness direction and includes a second pattern P2 that is the same as the first pattern P1, and a third pattern P3 arranged at the same position in the thickness direction as the second pattern P2.

Description

[Technical field]

[0001] The present invention relates to jewelry having varying surface patterns and methods of making jewelry. [Background technology]

[0002] Patent Document 1 discloses a ring that is made of wood, which is less likely to cause allergies than metal, and has sufficient strength to prevent damage from external impacts or scratches while ensuring the warmth of wood when worn and a sense of visual comfort due to the wood's unique grain and color. In this ring, an outer ring is integrally provided with a wooden inner ring such that its inner surface is in intimate contact with the outer surface of the inner ring, and the outer ring is made of a material stronger than wood to reinforce the inner ring.

[0003] Patent Document 2 discloses a method for manufacturing a ring and a ring in which the pattern is continuous without breaks or steps all around. In this method, multiple types of metals are laminated to form a base metal, which is wound multiple times to form a ring, at least one recess is engraved on the inside and / or outside of the ring, and the recess is smoothed to manufacture the ring. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-158446 A [Patent Document 2] JP 2008-036350 A Summary of the Invention [Problem to be solved by the invention]

[0005] Jewelry such as wedding rings, which are worn for a long time, can develop scratches, dirt, and dullness on the surface over time. For this reason, it is preferable to perform maintenance such as regular cleaning and polishing. However, repeated polishing of the ring surface will gradually wear away the surface. If the ring has a pattern, the pattern will disappear or become difficult to see due to surface wear.

[0006] An object of the present invention is to provide a jewelry item that allows the wearer to enjoy changes in its pattern over time, and a method for manufacturing the jewelry item. [Means for solving the problem]

[0007] One aspect of the present invention is a piece of jewelry comprising a metal base portion having a first surface and a second surface opposite to the first surface, wherein a direction connecting the first surface and the second surface is a thickness direction, and the metal base portion has, in the thickness direction, a first region proximate to the first surface and a second region proximate to the second surface than the first region, wherein the first region includes a first pattern, and the second region is provided at a position overlapping the first pattern in the thickness direction and includes a second pattern that is the same as the first pattern, and a third pattern provided at a position not overlapping the first pattern in the thickness direction.

[0008] According to this configuration, as the metal base material gradually wears away from the first surface side in the thickness direction due to aging and maintenance, the pattern appearing on the surface changes from the first pattern appearing in the first region to the second and third patterns appearing in the second region. Since the second pattern has the same pattern as the first pattern at a position where it overlaps with the first pattern in the thickness direction, when the first region wears away and the second region is exposed on the surface, a new third pattern appears in addition to the second pattern that is the same as the first pattern, causing a change in the pattern.

[0009] Preferably, the first pattern is not exposed from the first surface. As a result, the first pattern is not exposed before the first surface of the metal base is worn away, and the first pattern becomes visible on the surface as the first surface wears away in the thickness direction.

[0010] Preferably, the first pattern, the second pattern, and the third pattern are at least one of characters and symbols. As a result, as the metal base wears from the first surface side in the thickness direction, the characters and symbols of the first pattern appear to progress to the characters and symbols of the second and third patterns, so that the meaning or message of the characters and symbols can be gradually grasped.

[0011] Preferably, the metal base part is ring-shaped and has a surface bare metal that does not include a pattern and is provided on the outermost periphery, the first region that is adjacent to the surface bare metal and is located inside the surface bare metal, and the second region that is adjacent to the first region and is located inside the first region. As a result, the pattern does not appear on the outermost surface of the ring-shaped metal base part, and the first pattern, the second pattern, and the third pattern are gradually exposed as the metal base part wears away.

[0012] Preferably, the metal base part is ring-shaped, and the first pattern and the second pattern overlap in a radial direction from a center of the ring of the metal base part, thereby suppressing misalignment between the first pattern and the second pattern due to a difference in diameter between the outer periphery and the inner periphery of the ring shape.

[0013] Another aspect of the present invention is a method for manufacturing jewelry, comprising: a first stamping step of stamping a first pattern on a first metal bullion; a first rolling step of rolling the first metal bullion with the first pattern stamped thereon; a second stamping step of stamping a second pattern that is the same as the first pattern and a third pattern at the same depth as the second pattern on a second metal bullion; a second rolling step of rolling the second metal bullion with the second pattern and the third pattern stamped thereon; and a joining step of stacking the first metal bullion and the second metal bullion that have been rolled so that the first pattern and the second pattern are overlapped, and joining them by applying pressure and heat.

[0014] With this configuration, a jewelry item is produced in which the metal substrate gradually wears in the thickness direction from the first surface side over time and through maintenance, causing the pattern appearing on the surface to change from the first pattern appearing in the first region to the second pattern and third pattern appearing in the second region.

[0015] Preferably, each of the first metal ingot and the second metal ingot is formed by stacking and rolling a plurality of dissimilar metals, the first rolling step includes removing raised portions of the edges of the first pattern of the first metal ingot when the first metal ingot on which the first pattern is stamped is rolled, and the second rolling step includes removing raised portions of the edges of the second pattern and the edges of the third pattern of the second metal ingot when the second metal ingot on which the second pattern and the third pattern are stamped is rolled. This removes the raised portions of the edges of the patterns when the metal ingot is rolled after the patterns are stamped, and suppresses crushing of the patterns due to rolling.

[0016] Preferably, the method further comprises a ring forming step of forming the laminated metal including the joined first metal bullion and the second metal bullion into a ring shape after the joining step, thereby producing a jewelry item having a ring shape such as a ring or a finger ring, in which the pattern exposed by the wear of the ring surface changes.

[0017] Preferably, the joining step includes stacking a surface metal without a pattern engraved thereon, the first metal metal, and the second metal metal so that the surface metal is on the outermost surface side, and joining them by applying pressure and heat. This produces a jewelry item in which the pattern is not exposed on the outermost surface of the metal base material, and the first pattern, the second pattern, and the third pattern are gradually exposed as the metal base material wears away. Effect of the Invention

[0018] According to the present invention, it is possible to provide a jewelry item and a manufacturing method for the jewelry item, which allows the wearer to enjoy changes in the pattern over time. [Brief description of the drawings]

[0019] [Figure 1] 1(a) to (c) are schematic perspective views illustrating a jewelry item according to this embodiment. [Diagram 2] 2(a) to (c) are schematic cross-sectional views illustrating the internal structure of the jewelry according to this embodiment. [Diagram 3] 3(a) to (c) are schematic plan views illustrating metal bullion constituting the metal substrate of the jewelry according to this embodiment. [Figure 4] FIG. 4 is a flow chart illustrating a method for manufacturing a jewelry item according to this embodiment. [Diagram 5] FIG. 5 is a flow chart illustrating a specific example of a method for manufacturing a jewelry item according to this embodiment. [Figure 6] FIG. 6 is a flow chart illustrating a specific example of a method for manufacturing a jewelry item according to this embodiment. [Figure 7] FIG. 7 is a flow chart illustrating a specific example of a method for manufacturing a jewelry item according to this embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the same members are designated by the same reference numerals, and the description of members that have already been described will be omitted as appropriate.

[0021] (Jewelry Composition) 1(a) to (c) are schematic perspective views illustrating a jewelry item according to this embodiment. 2(a) to (c) are schematic cross-sectional views illustrating the internal structure of the jewelry according to this embodiment. The jewelry 1 according to this embodiment changes its pattern while it is being used due to aging, maintenance, etc. An example of the jewelry 1 is a ring.

[0022] The jewelry 1 includes a metal substrate 10. When the jewelry 1 is a finger ring, the metal substrate 10 is formed in a ring shape. In this embodiment, the outer peripheral surface of the metal substrate 10 is referred to as a first surface 10a, the opposite side (inner peripheral surface) of the metal substrate 10 to the first surface 10a is referred to as a second surface 10b, and the direction connecting the first surface 10a and the second surface 10b is referred to as a thickness direction. When the metal substrate 10 is ring-shaped, the thickness direction is also the radial direction of the ring shape.

[0023] The metal substrate 10 has a first region 11 proximal to the first surface 10a in the thickness direction, and a second region 12 proximal to the second surface 10b than the first region 11. That is, the first region 11 and the second region 12 are regions of different layers in the thickness direction. The first region 11 and the second region 12 may have a clear boundary between layers, but may not have a clear boundary. Therefore, the first region 11 and the second region are regions that have a predetermined thickness and are located at different positions in the thickness direction of the metal substrate 10. When the metal substrate 10 is ring-shaped, the first region 11 and the second region 12 are ring-shaped regions of a predetermined thickness along the circumference of the ring. The first region 11 is located closer to the outer periphery of the metal substrate 10 than the second region 12, and the second region 12 is located closer to the inner periphery of the metal substrate 10 than the first region 11. It is preferable that the first region 11 and the second region 12 are adjacent to each other in the thickness direction.

[0024] The first region 11 includes a first pattern P1. The first pattern P1 is, for example, a character or a symbol. As an example, in this embodiment, the first pattern P1 is an English character. The first pattern P1 is made of a material or composition different from the parts of the first region 11 of the metal base portion 10 other than the first pattern P1.

[0025] The second region 12 includes a second pattern P2 and a third pattern P3. The second pattern P2 is provided at a position overlapping the first pattern P1 included in the first region 11 in the thickness direction, and is the same pattern as the first pattern P1. If the first pattern P1 is, for example, an English letter, the second pattern P2 is the same English letter as the first pattern P1. The third pattern P3 is provided at a position not overlapping the first pattern P1 in the thickness direction. The third pattern P3 is preferably provided at the same position in the second region 12 as the second pattern P2 in the thickness direction.

[0026] The third pattern P3 may be the same as or different from the second pattern P2 in terms of characters or symbols. In addition, no pattern may be provided in the position of the first region 11 that overlaps with the third pattern P3 in the thickness direction, or a pattern different from the third pattern P3 may be provided.

[0027] The metal base member 10 may include a background pattern (such as mokume gane). The first pattern P1, the second pattern P2, and the third pattern P3 are different from the background pattern of the metal base member 10.

[0028] 1(a) to (c) show in sequence how the jewelry 1 according to the present embodiment changes due to wear over time and maintenance, etc. Fig. 2(a) to (c) show schematic cross-sectional views of the metal substrate 10 corresponding to the changes in the jewelry 1 shown in Fig. 1(a) to (c). As shown in Fig. 2(a) to (c), the metal substrate part 10 of the jewelry 1 is provided on a support bullion 20. The metal substrate part 10 has a configuration in which a first region 11 is laminated on top of (the outer periphery side of) a second region 12. The metal substrate part 10 may have a surface bullion 30 on the first surface 10a side (the outer periphery side). The surface bullion 30 may not include a pattern. The surface bullion 30 may be plain or may include a pattern (such as mokume gane).

[0029] The surface (first surface 10a side) of the metal substrate 10 wears away in the order shown in Figures 1(a) to 1(c) and Figures 2(a) to 2(c). As shown in Figures 1(a) and 2(a), when the surface bare metal 30 remains, the first pattern P1 is not exposed from the first surface 10a.

[0030] When the surface metal 30 wears down due to aging or maintenance, the first pattern P1 of the first region 11 appears on the first surface 10a of the metal substrate 10, as shown in Figures 1(b) and 2(b). At this stage, only the first pattern P1 of the first region 11 appears on the first surface 10a.

[0031] As the wear progresses further and the second region 12 is exposed on the first surface 10a of the metal substrate 10 as shown in FIG. 1(c) and FIG. 2(c), the second pattern P2 and the third pattern P3 of the second region 12 are exposed. Here, the second pattern P2 of the second region 12 is provided at a position overlapping the first pattern P1 of the first region 11 in the thickness direction, and is the same as the first pattern P1. Therefore, even if the wear progresses from the state shown in FIG. 1(b) and FIG. 2(b) (the state where the first region 11 is exposed) to the state shown in FIG. 1(c) and FIG. 2(c) (the state where the second region 12 is exposed), the pattern does not change from the first pattern P1 to the second pattern P2. However, the third pattern P3 is newly exposed due to the exposure of the second region 12.

[0032] For example, as shown in Figs. 1(b) and (c), if the first pattern P1 and the second pattern P2 are the same English letter "L," and the third pattern P3 is the English letters "o," "v," and "e" next to the English letter "L" of the second pattern P2 as shown in Fig. 1(c), only the English letter "L" of the first pattern P1 appears due to the exposure of the first region 11 shown in Fig. 1(b). Then, when the second region 12 appears as shown in Fig. 1(c) due to wear over time, the English letters "o," "v," and "e" of the third pattern P3 appear next to the English letter "L" of the second pattern P2, which is the same as the first pattern P1. Therefore, the pattern changes from only the English letter "L" to "L," "o," "v," and "e" over time. In this way, as wear progresses over time, the meaning or message of the letters or symbols gradually becomes comprehensible.

[0033] 3(a) to (c) are schematic plan views illustrating metal bullion constituting the metal substrate of the jewelry according to this embodiment. Fig. 3(a) shows a surface ingot 30, Fig. 3(b) shows a first metal ingot 110, and Fig. 3(c) shows a second metal ingot 120. The surface ingot 30, the first metal ingot 110, and the second metal ingot 120 shown in Figs. 3(a) to 3(c) are stacked and rolled to form a metal base portion 10.

[0034] The surface base metal 30 shown in FIG. 3(a) is provided on the outermost periphery of the metal substrate part 10. The surface base metal 30 does not include any pattern such as the first pattern P1. The surface base metal 30 does not necessarily have to be provided on the metal substrate part 10. Since the surface base metal 30 does not include any pattern, no pattern is exposed on the first surface 10a, which is the surface of the metal substrate part 10, when the surface base metal 30 remains. When the surface base metal 30 is not provided, the first metal base metal 110 shown in FIG. 3(b) becomes the outermost periphery of the metal substrate part 10, and the first pattern P1 is exposed.

[0035] The first metal bullion 110 shown in FIG. 3(b) is a bullion constituting the first region 11. The first metal bullion 110 is provided with a first pattern P1. The second metal bullion 120 shown in FIG. 3(c) is a bullion constituting the second region 12. The second metal bullion 120 is provided with a second pattern P2 that is the same as the first pattern P1 at the same position (overlapping position in the thickness direction) as the first pattern P1 of the first metal bullion 110. In addition, the second metal bullion 120 is provided with a third pattern P3. In the first metal bullion 110, a pattern that is the same as the third pattern P3 is not provided at the same position (overlapping position in the thickness direction) as the third pattern P3 of the second metal bullion 120. In the example shown in FIG. 3(b), no pattern is provided on the first metal bullion 110 at the same position as the third pattern P3. The surface metal 30, the first metal metal 110 and the second metal metal 120 are stacked together with the supporting metal 20 (see FIG. 2) and rolled to form the metal base portion 10 on the supporting metal 20.

[0036] When the metal substrate part 10 is ring-shaped, it is preferable that the first pattern P1 and the second pattern P2 overlap in a radial direction from the ring center of the metal substrate part 10. That is, when the metal substrate part 10 is ring-shaped, the first region 11 is disposed on the outer periphery side relative to the second region 12. Since wear of the metal substrate part 10 progresses toward the inside in the radial direction, by aligning the first pattern P1 and the second pattern P2 in the radial direction, misalignment between the first pattern P1 and the second pattern P2 due to the difference in diameter between the outer periphery side and the inner periphery side of the ring shape is suppressed.

[0037] (Jewelry Manufacturing Method) Next, a method for manufacturing the jewelry 1 according to this embodiment will be described. FIG. 4 is a flow chart illustrating a method for manufacturing a jewelry item according to this embodiment. First, a first marking step is performed as shown in step S101 of Fig. 4. In the first marking step, a process of marking a first pattern P1 on a first metal ingot 110 is performed.

[0038] Next, a first rolling step is performed as shown in step S102. In the first rolling step, a treatment is performed to roll the first metal ingot 110 on which the first pattern P1 has been stamped in the first marking step.

[0039] Next, as shown in step S103, a second marking process is performed. In the second marking process, a process is performed in which a second pattern P2 that is the same as the first pattern P1 and a third pattern P3 at the same depth as the second pattern P2 are marked on the second metal ingot 120.

[0040] Next, a second rolling step is performed as shown in step S104. In the second rolling step, a treatment is performed to roll the second metal ingot 120 on which the second pattern P2 and the third pattern P3 have been stamped in the second marking step.

[0041] Next, as shown in step S105, a joining process is performed. In the joining process, the first metal bullion 110 rolled in the first rolling process and the second metal bullion 120 rolled in the second rolling process are stacked so that the first pattern P1 and the second pattern P2 overlap, and are joined by applying pressure and heat. In this way, the jewelry 1 having the metal substrate 10 is manufactured.

[0042] (Specific examples of jewelry manufacturing methods) 5 to 7 are flow charts illustrating specific examples of the method for manufacturing a jewelry item according to this embodiment. First, as shown in step S201 of Fig. 5, the surfaces of dissimilar metals are polished. For example, about 15 to 20 sheets of precious metals such as silver, platinum, gold, and copper are prepared, and the front and back surfaces of these metal sheets are polished to remove oil films and oxide films. The thickness of each metal sheet is about 0.2 mm to 0.3 mm.

[0043] Next, as shown in step S202, the dissimilar metals are stacked together. Then, as shown in step S203, the stacked dissimilar metals are fixed with a jig. For example, the jig is fixed by applying an appropriate pressure (approximately 6000 Psi to 7000 Psi) using a hydraulic press.

[0044] Next, as shown in step S204, the dissimilar metals are heated and bonded. For example, they are heated in an electric furnace at an appropriate temperature (about 700°C to 800°C) for about 8 to 9 hours to be bonded. The thickness of the laminated ingot formed by the bonding is about 5.5 mm to 6 mm.

[0045] Next, as shown in step S205, the joined dissimilar metals (laminated ingot) are annealed and rolled. This annealing and rolling are repeated until the required dimensions are reached. As a result, the thickness of the laminated ingot becomes approximately 1.7 mm.

[0046] Next, as shown in step S206, the rolled laminated ingot is engraved. For example, a pattern such as letters or symbols is engraved on the surface of the laminated ingot using a laser cutting machine. By engraving on the laminated ingot with a thickness of about 1.7 mm, a pattern with an engraving depth of about 0.4 mm and a pattern thickness (thickness of lines such as letters) of about 0.5 mm to 0.8 mm is engraved. Note that if the pattern thickness is less than 0.5 mm, the pattern is likely to be crushed when it is rolled in the next process.

[0047] Next, as shown in step S207, the stamped laminated ingot is annealed and rolled. This annealing and rolling are repeated until the required dimensions are reached. Then, as shown in step S208, the ridges on the edges of the stamp are removed.

[0048] Here, when the stamped laminated ingot is rolled, the edge of the stamp becomes raised. In other words, the stamped portion is scraped off to form a step. For this reason, by rolling, the step portion of the stamp is crushed and the material at the bottom portion of the stamp is lifted. The crushing of the step and the lifting of the bottom portion combine to cause the edge of the stamp to become raised. In step S208, this raised portion is removed by cutting. This prevents the pattern from being crushed by rolling, and leaves the pattern clean.

[0049] Next, as shown in step S209, the annealing and rolling in step S207 and the removal of the ridges on the edges of the markings in step S208 are repeated a predetermined number of times. This results in a laminated ingot with the pattern exposed. The thickness of the laminated ingot is about 0.8 mm.

[0050] The processes from step S201 to step S209 create a first metal ingot 110 (see FIG. 3(b)) and a second metal ingot 120 (see FIG. 3(c)), which are layered ingots with patterns exposed. For example, the first metal ingot 110 has the letters "L", "O", "M", and "L" exposed as a first pattern P1. The second metal ingot 120 has the same letters "L", "O", "M", and "L" as the first pattern P1 exposed at a position overlapping with the first pattern P1 as a second pattern P2, and the letters "o", "v", "e", "f", "y", "i", "f", and "e" exposed as a third pattern P3.

[0051] For the convenience of explaining the manufacturing method hereinafter, the first metal ingot 110 will be referred to as ingot (B), the second metal ingot 120 as ingot (C), the surface ingot 30 as ingot (A), and the support ingot 20 as ingot (D).

[0052] Next, as shown in step S301 of Fig. 6, the base metal (B) is ground. This causes the base metal (B) to be ground until it has a required dimension. For example, grinding is performed until the thickness of the base metal (B) is about 0.1 mm.

[0053] Next, as shown in step S302, the metals (A), (B), and (C) are polished. This polishing removes oil films and oxide films from the surfaces of the metals (A), (B), and (C). Here, the thickness of the metal (A) is about 0.1 mm, the thickness of the metal (B) is about 0.1 mm, and the thickness of the metal (C) is about 0.8 mm.

[0054] Next, as shown in step S303, the metals (A), (B), and (C) are stacked. Then, as shown in step S304, the metals (A), (B), and (C) are fixed with a jig. For example, the stacked metals (A), (B), and (C) are fixed with a jig by applying an appropriate pressure (approximately 6000 Psi to 7000 Psi) with a hydraulic press. As a result, the thickness of the stacked metals (A), (B), and (C) becomes approximately 1.0 mm.

[0055] Next, as shown in step S305, the laminated metals (A), (B), and (C) are heated and bonded. For example, they are heated in an electric furnace at an appropriate temperature (about 700°C to 800°C) for about 8 to 9 hours to be bonded. The thickness of the laminated metal formed by bonding is about 1.0 mm.

[0056] Next, as shown in step S401 of FIG. 7, the laminated metal (metals (A), (B), and (C) stacked and heated to bond) and metal (D) are cut to a predetermined size. For example, grinding is performed until the thickness of the laminated metal is about 1.0 mm and the thickness of metal (D) is about 0.5 mm. This laminated metal is a metal base part 10 composed of a surface metal 30 which is metal (A), a first metal metal 110 which is metal (B), and a second metal metal 120 which is metal (C). When manufacturing a ring-shaped jewelry 1, in a later step, the metal base part 10 becomes an outer ring and the metal (D) becomes an inner ring.

[0057] Next, as shown in step S402, the laminated ingot and the ingot (D) are rolled into a circle. That is, the metal base material portion 10, which is the laminated ingot, is rolled into a circle, and the main steel (D) is rolled into a circle with the support ingot 20. Next, as shown in step S403, the joining surfaces where both ends of the laminated ingot rolled into a circle are joined are brazed. Also, the joining surfaces where both ends of the ingot (D) rolled into a circle are brazed.

[0058] Next, as shown in step S404, the metal base member 10, which is the laminated base metal rolled into a circle, is set as the outer ring, and the base metal (D), which is the supporting base metal 20, is set as the inner ring, and the inner ring is fitted into the outer ring. This forms a ring member in which the ring-shaped supporting base metal 20 is fitted inside the ring-shaped metal base member 10. The joint surfaces between the outer ring and the inner ring are brazed.

[0059] Next, as shown in step S405, the ring is cut. That is, unnecessary brazing material from the brazing of the joint surface between the outer ring and the inner ring performed in step S404 is removed, and the ring is cut to the required dimensions using a steel file or the like.

[0060] Next, as shown in step S406, the size of the ring member is adjusted, whereby the ring diameter of the ring member is adjusted to a required size.

[0061] Next, as shown in step S407, the surface of the ring is polished. That is, the front, side and back of the ring member are polished. In this way, the jewelry 1 is completed.

[0062] For example, if a ring-shaped jewelry piece 1 is manufactured using the above-described manufacturing method using the surface bullion 30 shown in Figure 3(a) as the bullion (A), the first metal bullion 110 shown in Figure 3(b) as the bullion (B), and the second metal bullion 120 shown in Figure 3(c) as the bullion (C), the thickness of the surface bullion 30 will be approximately 0.1 mm, the thickness of the first metal bullion 110 (first region 11) will be approximately 0.1 mm, and the thickness of the second metal bullion 120 (second region 12) will be approximately 0.8 mm.

[0063] Immediately after the jewelry piece 1 is completed, no pattern is visible on the surface of the ring-shaped jewelry piece 1 (see FIG. 1(a)).

[0064] If we assume that the thickness of the surface scraped off when the jewelry 1 is polished and dirt is removed in one maintenance session is 0.01 mm, then after ten maintenance sessions, the surface base metal 30 will be completely scraped off, exposing the first region 11, which is the first metal base metal 110 underneath. This will reveal the letters "L", "O", "M", and "L", which are the first pattern P1 (see Figures 1(b) and 3(b)). If maintenance is performed once a year, it will take 10 years for the first pattern P1 to become visible. At this stage, the meaning of the letters is not clear.

[0065] After the first pattern P1 appears, the first metal base metal 110 is polished by further performing maintenance. Even if the surface is polished here, the first pattern P1 will not disappear as long as the first region 11, which is the first metal base metal 110, remains. After the first metal base metal 110 is exposed, the first metal base metal 110 is completely scraped off by performing maintenance 10 times. This exposes the second region 12, which is the second metal base metal 120 underneath. When the second region 12 is exposed, the second pattern P2, which is "L", "O", "M", and "L", and the third pattern P3, which is the English letters "o", "v", "e", "f", "y", "i", "f", and "e", are exposed (see FIG. 1(c) and FIG. 3(c)). If maintenance is performed once a year, the period from when the first pattern P1 appears to when the second pattern P2 and the third pattern P3 appear is 10 years.

[0066] Since the English letters in the first pattern P1 and the English letters in the second pattern P2 are the same characters in the same position, a change in the letters in that position cannot be recognized. On the other hand, the English letters in the third pattern P3 are revealed only when the second region 12 is exposed. When the third pattern P3 is revealed, the letters "Love Of My Life" are completed by combining the second pattern P2 and the third pattern P3. This allows the hidden message engraved inside the jewelry 1 to be revealed.

[0067] As described above, according to the present embodiment, it is possible to provide a jewelry 1 and a manufacturing method for the jewelry 1, which allows the wearer to enjoy changes in the pattern over time of use.

[0068] Although the present embodiment and its application examples have been described above, the present invention is not limited to these examples. For example, the jewelry 1 can be applied to ring-shaped items such as rings and finger rings, as well as non-ring-shaped items such as bracelets and name pendant heads. In addition, items in which a person skilled in the art appropriately adds, deletes, or modifies components of the above-mentioned embodiment or its application examples, or items in which the features of each embodiment are appropriately combined, are also included in the scope of the present invention as long as they include the gist of the present invention. [Explanation of symbols]

[0069] 1...jewelry item, 10...metal substrate portion, 10a...first surface, 10b...second surface, 11...first region, 12...second region, 20...support base metal, 30...surface base metal, 110...first metal base metal, 120...second metal base metal, P1...first pattern, P2...second pattern, P3...third pattern

Claims

1. A jewelry item including a metal substrate having a first surface, a second surface opposite to the first surface, and a surface base metal, A direction connecting the first surface and the second surface is defined as a thickness direction, the metal base portion is a member that wears over time, and the first surface and the second surface are exposed due to friction; a first region proximate to the first surface in the thickness direction, and a second region proximate to the second surface relative to the first region, the first region includes a first pattern; The second region includes a second pattern that is the same as the first pattern and is positioned so as to overlap with the first pattern in the thickness direction, and a third pattern that is positioned so as not to overlap with the first pattern in the thickness direction.

2. The jewelry item of claim 1 , wherein the first pattern is not exposed from the first surface.

3. The jewelry item of claim 1 , wherein the first pattern, the second pattern, and the third pattern are at least one of letters and symbols.

4. The metal substrate is ring-shaped, The jewelry item of claim 1, wherein the metal base portion has a surface base metal that does not include a pattern and is provided on the outermost peripheral side, the first region that is adjacent to the surface base metal and is located inside the surface base metal, and the second region that is adjacent to the first region and is located inside the first region.

5. The metal substrate is ring-shaped, The jewelry item according to claim 1 , wherein the first pattern and the second pattern overlap in a radial direction from a ring center of the metal base portion.

6. a first marking step of marking a first pattern on a first metal ingot; a first rolling step of rolling the first metal ingot on which the first pattern is engraved; a second marking step of marking a second pattern, the second pattern being the same as the first pattern, and a third pattern at the same depth as the second pattern, on a second metal base metal; a second rolling step of rolling the second metal ingot on which the second pattern and the third pattern are imprinted; a bonding process in which the first metal ingot and the second metal ingot that have been rolled so as to overlap the first pattern and the second pattern are laminated and bonded by applying pressure and heat; A method for manufacturing jewelry comprising the steps of:

7. Each of the first metal ingot and the second metal ingot is formed by stacking and rolling a plurality of dissimilar metals, the first rolling step includes removing a raised portion of an edge of the first pattern of the first metal ingot when the first metal ingot on which the first pattern is imprinted is rolled; 7. The method for manufacturing a jewelry item according to claim 6, wherein the second rolling step includes removing raised portions of the edges of the second pattern and the edges of the third pattern of the second metal bullion when the second metal bullion having the second pattern and the third pattern engraved thereon is rolled.

8. The method for manufacturing a jewelry item according to claim 6, further comprising a ring forming step of forming a laminated metal including the joined first metal bullion and the second metal bullion into a ring shape after the joining step.

9. The method for manufacturing a jewelry item described in any one of claims 6 to 8, wherein the joining step includes stacking a surface bullion having no pattern engraved thereon, the first metal bullion, and the second metal bullion with the surface bullion being on the outermost surface side, and joining them by applying pressure and heat.

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