Jewelry article and method of manufacturing a jewelry article

Abstract

To provide jewelry allowing a user to enjoy a change of a pattern by using the jewelry for a long time, and a method for manufacturing the jewelry.SOLUTION: One aspect of the present invention is a jewel 1 including a metallic base 10 having a first surface 10a and a second surface 10a opposite to the first surface 10b, the metallic base 10 having, in a thickness direction connecting the first surface 10a and the second surface 10b, a first region 11 closer to the first surface 10a and a second region 12 closer to the second surface 10b than the first region 11, the first region 11 including a first pattern P1, the second region 12 is provided at a position overlapping the first pattern P1 in the thickness direction, and includes a second pattern P1 that is the same as the first pattern P2, and a third pattern P2 that is provided at the same position as the second pattern P3 in the thickness direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to jewelry having varying patterns on its surface and to a method for making the same. [Background technology]

[0002] Patent Document 1 discloses a ring that is made of wood, which is less likely to cause allergies than metal, and that has sufficient strength to prevent breakage due to external impacts or scratches, while maintaining the warmth of wood when in use and a soothing appearance due to the wood's unique grain and color. This ring has an outer ring that is integral with a wooden inner ring, with its inner surface in close contact with the outer surface, 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 and without breaks around the entire circumference. In this method, a base metal is formed by laminating multiple types of metal, and the base metal is wound multiple times to form a ring. At least one recess is carved into 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] Japanese Patent Application Laid-Open No. 2013-158446 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-036350 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, stains, and tarnish over time. For this reason, it is advisable to regularly clean and polish the ring for maintenance. However, repeated polishing of the ring's surface gradually wears it down. If the ring has a pattern, the pattern may disappear or become difficult to see due to surface wear.

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

[0007] One aspect of the present invention is a jewelry item comprising a metal substrate having a first surface and a second surface opposite to the first surface, wherein the direction connecting the first surface and the second surface is a thickness direction, and the metal substrate has, in the thickness direction, a first region that is closer to the first surface and a second region that is closer to the second surface than the first region, and the first region includes a first pattern, and the second region is positioned so as to overlap the first pattern in the thickness direction and includes a second pattern that is the same as the first pattern, and a third pattern that is positioned so as not to overlap the first pattern in the thickness direction.

[0008] With this configuration, as the metal substrate gradually wears in the thickness direction from the first surface side due to aging and maintenance, the pattern that appears on the surface changes from the first pattern appearing in the first region to the second and third patterns appearing in the second region. Because the second pattern is the same as the first pattern at a position that overlaps with the first pattern in the thickness direction, when the first region wears and the second region is exposed on the surface, the second pattern that is the same as the first pattern appears, and a new third pattern appears, causing a change in the pattern.

[0009] Preferably, the first pattern is not exposed from the first surface, so that the first pattern is not exposed before the first surface of the metal base is worn away, and the first pattern becomes visible 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 letters and symbols. As a result, as the metal substrate wears from the first surface side in the thickness direction, the letters and symbols of the first pattern appear to progress to the letters and symbols of the second and third patterns, so that the meaning or message of the letters and symbols can be gradually grasped.

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

[0012] Preferably, the metal base portion has a ring shape, and the first pattern and the second pattern overlap in a radial direction from the center of the ring of the metal base portion, thereby suppressing misalignment between the first pattern and the second pattern due to a difference in diameter between the outer and inner sides 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 on which the first pattern has been stamped; a second stamping step of stamping a second pattern on a second metal bullion, the second pattern being the same as the first pattern, and a third pattern at the same depth as the second pattern; a second rolling step of rolling the second metal bullion on which the second pattern and the third pattern have been stamped; 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 overlap, and joining them by applying pressure and heat.

[0014] With this configuration, as the metal substrate gradually wears in the thickness direction from the first surface side over time and through maintenance, a jewelry item is produced in which 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.

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

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

[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 does not appear on the outermost surface of the metal base material, and the first, second, and third patterns gradually become exposed as the metal base material wears away. [Effects of the Invention]

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

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

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

[0021] (Jewelry composition) 1(a) to 1(c) are schematic perspective views illustrating jewelry according to this embodiment. 2(a) to 2(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 over time as it is used and undergoes maintenance, etc. An example of the jewelry 1 is a ring.

[0022] The jewelry item 1 includes a metal substrate 10. When the jewelry item 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 from 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 that is closer to the first surface 10a in the thickness direction and a second region 12 that is closer 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. Note that the first region 11 and the second region 12 may or may not have a clear layer boundary. Therefore, the first region 11 and the second region 12 each have a predetermined thickness and are regions 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 each 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. The first region 11 and the second region 12 are preferably 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 letter or a symbol. As an example, in this embodiment, the first pattern P1 is an English letter. The first pattern P1 is made of a material or composition different from that of the portion of the first region 11 of the metal substrate 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. It is preferable that the third pattern P3 be 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 letters or symbols. Furthermore, 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 1(c) sequentially show how jewelry 1 according to this embodiment changes due to wear over time, maintenance, etc. Figures 2(a) to 2(c) show schematic cross-sectional views of the metal substrate 10 corresponding to the changes in jewelry 1 shown in Figures 1(a) to 1(c). As shown in Figures 2(a) to (c), the metal substrate 10 of the jewelry 1 is provided on a support metal 20. The metal substrate 10 has a configuration in which a first region 11 is laminated on top of (the outer periphery of) a second region 12. The metal substrate 10 may have a surface metal 30 on the first surface 10a side (the outer periphery). The surface metal 30 may not have a pattern. The surface metal 30 may be plain or may have 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 portion 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 wear progresses further, the second region 12 is exposed on the first surface 10a of the metal substrate 10, as shown in FIGS. 1(c) and 2(c), and 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 positioned so as to overlap the first pattern P1 of the first region 11 in the thickness direction and is identical to the first pattern P1. Therefore, even if wear progresses from the state shown in FIGS. 1(b) and 2(b) (where the first region 11 is exposed) to the state shown in FIGS. 1(c) and 2(c) (where the second region 12 is exposed), the pattern does not change from the first pattern P1 to the second pattern P2. However, the exposure of the second region 12 newly exposes the third pattern P3.

[0032] For example, as shown in Figures 1(b) and 1(c), if the first pattern P1 and the second pattern P2 are the same letter "L," and the third pattern P3 is the letters "o," "v," and "e" next to the letter "L" in the second pattern P2 as shown in Figure 1(c), only the letter "L" in the first pattern P1 will be revealed when the first region 11 shown in Figure 1(b) is revealed. Then, as the second region 12 is revealed as shown in Figure 1(c), the letters "o," "v," and "e" in the third pattern P3 will appear next to the letter "L" in the second pattern P2, which is the same as the letter "L" in the first pattern P1. Therefore, over time, the pattern will change from just the letter "L" to "L," "o," "v," and "e." In this way, as the wear progresses over time, the meaning and message of the letters and symbols will gradually become clear.

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

[0034] The surface base metal 30 shown in FIG. 3(a) is provided on the outermost periphery of the metal substrate 10. The surface base metal 30 does not include any pattern such as the first pattern P1. The surface base metal 30 does not have to be provided on the metal substrate 10. Because 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 10, when the surface base metal 30 remains. If 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 10, and the first pattern P1 is exposed.

[0035] The first metal bullion 110 shown in FIG. 3(b) is a bullion that constitutes the first region 11. A first pattern P1 is provided on the first metal bullion 110. The second metal bullion 120 shown in FIG. 3(c) is a bullion that constitutes the second region 12. A second pattern P2 that is the same as the first pattern P1 is provided on the second metal bullion 120 at the same position (overlapping position in the thickness direction) as the first pattern P1 on the first metal bullion 110. In addition, a third pattern P3 is provided on the second metal bullion 120. On 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 on 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 support metal 20 (see FIG. 2) and rolled to form the metal substrate 10 on the support metal 20.

[0036] When the metal substrate 10 is ring-shaped, it is preferable that the first pattern P1 and the second pattern P2 overlap and match in the radial direction from the center of the ring of the metal substrate 10. That is, when the metal substrate 10 is ring-shaped, the first region 11 is disposed on the outer periphery side of the second region 12. Since wear of the metal substrate 10 progresses radially inward, by matching the first pattern P1 and the second pattern P2 in the radial direction, misalignment between the first pattern P1 and the second pattern P2 caused by the difference in diameter between the outer and inner peripheries 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 flowchart 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 the first metal ingot 110 is performed.

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

[0039] Next, as shown in step S103, a second marking process is performed. In the second marking process, 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 base metal 120.

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

[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, a jewelry item 1 including a metal substrate portion 10 is manufactured.

[0042] (Specific example of jewelry manufacturing method) 5 to 7 are flow charts illustrating specific examples of the method for manufacturing jewelry according to this embodiment. First, as shown in step S201 of Figure 5, the surfaces of dissimilar metals are polished. For example, about 15 to 20 plates of precious metals such as silver, platinum, gold, or copper are prepared, and the front and back surfaces of these metal plates are polished to remove oil films and oxide coatings. The thickness of each metal plate is about 0.2 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 bond them. The thickness of the laminated metal 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 is 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 metal is engraved. For example, a pattern such as letters or symbols is engraved on the surface of the laminated metal using a laser cutting machine. By engraving on a laminated metal with a thickness of approximately 1.7 mm, a pattern with an engraving depth of approximately 0.4 mm and a pattern thickness (thickness of lines such as letters) of approximately 0.5 mm to 0.8 mm is carved. 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 is repeated until the required dimensions are reached. Then, as shown in step S208, the protrusions on the edges of the stamp are removed.

[0048] When the stamped laminated metal is rolled, the edges of the stamp become raised. In other words, the stamped portion is scraped away, creating a step. Therefore, by rolling, the step portion of the stamp is flattened, and the material at the bottom of the stamp is lifted. The combination of the flattening of the step and the lifting of the bottom portion causes 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 allows the pattern to remain clean.

[0049] Next, as shown in step S209, the annealing and rolling of step S207 and the removal of the ridges at the edges of the markings as shown 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 approximately 0.8 mm.

[0050] The processes from step S201 to step S209 create a first metal base metal 110 (see FIG. 3(b)) and a second metal base metal 120 (see FIG. 3(c)), which are laminated base metals with patterns exposed. For example, the first metal base metal 110 has the letters "L," "O," "M," and "L" exposed as a first pattern P1. The second metal base metal 120 has the same letters "L," "O," "M," and "L" as the first pattern P1 exposed in 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 base metal 110 will be referred to as base metal (B), the second metal base metal 120 will be referred to as base metal (C), the surface base metal 30 will be referred to as base metal (A), and the support base metal 20 will be referred to as base metal (D).

[0052] Next, as shown in step S301 of Fig. 6, the base metal (B) is ground. This allows the base metal (B) to be ground down to the required dimensions. For example, grinding is performed until the thickness of the base metal (B) is approximately 0.1 mm.

[0053] Next, as shown in step S302, the base metals (A), (B), and (C) are polished. This polishing removes oil films and oxide films from the surfaces of the base metals (A), (B), and (C). Here, the thickness of the base metal (A) is approximately 0.1 mm, the thickness of the base metal (B) is approximately 0.1 mm, and the thickness of the base metal (C) is approximately 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 in place with a jig. For example, the stacked metals (A), (B), and (C) are fixed in place with the jig by applying an appropriate pressure (approximately 6000 Psi to 7000 Psi) using a hydraulic press. This results in a thickness of the stacked metals (A), (B), and (C) of approximately 1.0 mm.

[0055] Next, as shown in step S305, the stacked 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 bond them. The thickness of the bonded stacked metal is about 1.0 mm.

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

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

[0058] Next, as shown in step S404, the metal substrate 10, which is the laminated metal rolled into a circle, is used as the outer ring, and the metal (D), which is the supporting metal 20, is used 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 metal 20 is fitted inside the ring-shaped metal substrate 10. The joint surfaces of 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 is removed from the brazing of the joining surfaces of the outer ring and the inner ring performed in step S404, 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 the required size.

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

[0062] For example, if a ring-shaped jewelry piece 1 is manufactured using the surface base metal 30 shown in Figure 3(a) as the base metal (A), the first metal base metal 110 shown in Figure 3(b) as the base metal (B), and the second metal base metal 120 shown in Figure 3(c) as the base metal (C) using the manufacturing method described above, the thickness of the surface base metal 30 will be approximately 0.1 mm, the thickness of the first metal base metal 110 (first region 11) will be approximately 0.1 mm, and the thickness of the second metal base metal 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 from the surface in one maintenance session is 0.01 mm, then after ten maintenance sessions, all of the surface base metal 30 will be 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 be exposed. At this stage, the meaning of the letters is unknown.

[0065] After the first pattern P1 is exposed, further maintenance is performed to polish the first metal base metal 110. Even if the surface is polished, 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, ten maintenances are performed to completely polish the first metal base metal 110. 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 consists of the letters "L," "O," "M," and "L," and the third pattern P3, which consists of the letters "o," "v," "e," "f," "y," "i," "f," and "e" (see FIGS. 1(c) and 3(c)). If maintenance is performed once a year, it will take 10 years from the exposure of the first pattern P1 until the second pattern P2 and the third pattern P3 are exposed.

[0066] Since the English letters in the first pattern P1 and the English letters in the second pattern P2 are the same in the same position, any change in the letters at that position is not recognizable. On the other hand, the English letters in the third pattern P3 are only revealed 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 this embodiment, it is possible to provide a jewelry 1 and a method for manufacturing the jewelry 1, which allows the wearer to enjoy the 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, jewelry 1 can be applied to ring-shaped objects such as rings and finger rings, as well as non-ring-shaped objects such as bracelets and name pendant heads. Furthermore, those skilled in the art who appropriately add, delete, or modify components of the above-described embodiment or its application examples, as well as those who appropriately combine features of each embodiment, are also encompassed within the scope of the present invention as long as they incorporate the gist of the present invention. [Explanation of symbols]

[0069] 1...jewelry, 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. 1. A jewelry item comprising a metal substrate having a first surface and a second surface opposite the first surface, A direction connecting the first surface and the second surface is defined as a thickness direction, The metal substrate portion is a first region closer to the first surface in the thickness direction and a second region closer to the second surface than the first region; the first region includes a first pattern; The second region includes a second pattern identical to the first pattern and positioned so as to overlap with the first pattern in the thickness direction, and a third pattern positioned so as not to overlap with the second 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 portion is ring-shaped, 2. The jewelry item of claim 1, wherein the metal substrate portion has a surface base metal that does not include a pattern and is provided on the outermost periphery, the first region that is located inside the surface base metal and adjacent to the surface base metal, and the second region that is located inside the first region and adjacent to the first region.

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

6. a first marking step of marking a first pattern on a first metal base metal; 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 identical to 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 joining step of stacking the first metal base metal and the second metal base metal that have been rolled so as to overlap the first pattern and the second pattern, and joining them by applying pressure and heat; A method for manufacturing jewelry comprising:

7. each of the first metal base metal and the second metal base metal is formed by laminating and rolling a plurality of different 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 on which the second pattern and the third pattern are engraved is rolled.

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

9. 9. A method for manufacturing a jewelry item as claimed in any one of claims 6 to 8, wherein the joining step includes stacking a surface base metal on which no pattern is engraved, the first metal base metal, and the second metal base metal so that the surface base metal is on the outermost surface side, and joining them by applying pressure and heat.

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