CONSTRUCTION OF FACETED GEMSTONES

Abstract

This invention relates generally to the construction of faceted gemstones and, in particular, to the faceted construction of a large brilliant cut diamond to provide enhanced luster and appearance.

Description

Title of the invention: CONSTRUCTION OF FACETED PRECIOUS STONES Field of invention

[0001] This invention relates generally to the construction of faceted gemstones and, in particular, to the faceted construction of a large brilliant cut diamond to provide enhanced luster and appearance.

[0002] The traditional diamond profile is illustrated in [Fig.l]. It has three basic sections for a brilliant-cut diamond: the crown 110, the girdle 120, and the pavilion 130. The girdle 120 is the narrow rim of the gemstone that separates the crown 110 from the pavilion 130. It is the section with the largest diameter of any part of the stone. Sometimes it is left in an unpolished state with a matte finish. However, to achieve a more overall shine, the girdle 120 is often ground. The crown 110 and pavilion 130 can be understood as the "top" and "bottom," respectively, of the brilliant-cut diamond. The small facet on the pointed bottom of the pavilion 130 is the collet 135. The large, flat top facet of the crown 110 is the table 115.

[0003] For a cut diamond, a characteristic of prime importance is its brilliance, which essentially corresponds to its brilliance. A diamond has a refractive index of 2.42, which is a very high value compared to that of other jewels (the index of crystal is 1.55; rubies and sapphires, 1.77). As a result, when the light rays incident on table 115 reach pavilion 130, most of the rays are totally reflected (i.e., the light rays do not escape from the diamond through pavilion 130, but are reflected inward again), and escape upon reaching crown 110, thus reaching the eyes of the observer as a sparkle. The angle 137 of pavilion 130 is important for total reflection, and is therefore important for the sparkle of a diamond.

[0004] The refractive index of diamond also results in the scattering of fully reflected light rays into the seven colors of the visible light spectrum. This rainbow effect is sometimes called the fire of the stone. Scintillation is the flickering of light reflected from a diamond caused by the movement of the observer or the diamond itself. Scintillation depends primarily on the size of the diamond, the number of facets, the polish of the facet, and the precision of the facet angles.

[0005] Diamonds are generally evaluated according to the "4 Cs": cut, clarity, color and carat. Cut refers to both the geometric proportions of a gemstone and the final shape into which the rough stone is formed. The most important cuts in the industry are round brilliant, oval, marquise, pear, heart, emerald, princess, trilliant, and radiant. A good cut gives the diamond its brilliance, dispersion, and scintillation—in short, its appearance and appeal.

[0006] The typical brilliant cut has 58 facets and can accommodate the "ideal cut," a range of proportions and angles that are maintained as standard by the American Gem Society. The number of 58 facets was determined in 1919, by diamond cutter Marcel Tolkowsky in his doctoral thesis that set the modern standard for a brilliant-cut diamond. Using only his own visual assessments of different diamond cut variations, Tolkowsky put forward a theory about the cutting angles that would produce the most proportionate balance of brilliance, scintillation, and dispersion in a gem-quality diamond. His measurements to achieve this balance were exact and stringent.

[0007] The configuration of these facets and their arrangements are designed to maximize the brilliance of a diamond by minimizing the amount of light that can escape through the pavilion 130, as well as maximizing the scintillation effect of the crown by increasing and varying the reflective surfaces.

[0008] To make a diamond of significant size, it is necessary to find a gem of sufficient size to allow cutting according to established standards, and whose entire volume presents the optimal qualities, which is very rare. State of the art

[0009] It has already been proposed in the state of the art to produce a precious stone by assembling several smaller cut stones.

[0010] Design patents USD791010 or USD830223S1 describe examples of composite stones.

[0011] Also known is application WO2008053267 describing a completely cut gemstone assembly by assembling a plurality of stones cut with specific angles to an accuracy of 1 millionth of an inch and which are assembled in a special configuration, so that the final jewel has the appearance of a whole diamond, or other whole gemstone. Another unique feature of the invention is the homogeneity of the table surface of the stones and its almost invisible appearance. The purpose of this prior art solution has been and is to create the appearance and reproduction of a round brilliant or other diamonds and gemstones of various shapes, in which the total carat weight used in the created diamond, or in the other created gemstones, is considerably less than what is currently required to achieve the same shape and appearance by current processes of cutting diamonds into their final shapes for setting in a piece of jewelry.

[0012] Patent FR2883711A1 is also known, describing a part consisting of a faceted body reproducing the shape of a large cut precious stone and on the outer wall of which small minerals are fixed.

[0013] Patent application US20100043493 describes another example of a gemstone structure comprising a plurality of individual gemstones joined by a common frame to define a composite gemstone unit having a lamination, a crown on one side of the lamination, and a pavilion on the opposite side of the lamination, each of the individual gemstones defining a segment of the composite gemstone unit, and comprising a lamination segment of the composite gemstone unit lamination, a crown segment of the composite gemstone unit crown, and a pavilion segment of the composite gemstone unit pavilion, the lamination and crown segments of at least a portion of the individual gemstones having an outer face to serve as an outer face of the lamination of the crown of the composite gemstone unit,the lamination segment of at least one individual gemstone portion having at least one smooth, flat, inner face in contact with a corresponding smooth, flat, inner face of the lamination segment of another individual gemstone in the composite gemstone unit, the common frame engaging the lamination segments of the individual gemstones to press the smooth, flat, inner faces of the individual gemstones into close contact with each other such that the composite gemstone unit appears substantially seamless to the naked eye. Disadvantages of the prior art

[0014] The documents of the prior art are not satisfactory because the addition of stone fragments certainly gives an external appearance similar to that of a stone cut according to diamond standards, but does not make it possible to simulate a finished cut stone obeying the cutting standards: table, crown, pavilion, girdle by simulating the same reflective power.

[0015] Furthermore, the stones are, in the solutions of the prior art, cut from rough diamond which requires large gems.

[0016] In the prior art, solutions based on the use of a set of cut fragments and not a set of cut stones require large rough. Also each fragment separately has lost the majority of its intrinsic value. Solution provided by the invention

[0017] In order to overcome the drawbacks of the prior art, the present invention relates, in its most general sense, to an ornamental piece, characterized in that it is made up of an assembly of four cut stones cut to form a large cut precious stone whose table is an octagon.

[0018] Preferably, the faceted body table is an octagon and has four stones, which recreate the table of a classic round diamond.

[0019] According to a variant, the other facets have a triangle shape.

[0020] According to another variant, the other facets have a diamond shape.

[0021] According to another variant, the other facets have a halefi shape, a little domed. for example trillion-cut diamonds.

[0022] These stones are each adjusted with stones in the shape of a triangle, a diamond or others.

[0023] According to a particular embodiment, the top of the cylinder head, the collar, is pointed.

[0024] The invention also relates to a method of manufacturing the faceted body of a large cut stone consisting of an assembly of fragments of cut stones to assemble a large cut precious stone whose table is an octagon.

[0025] Detailed description of a non-limiting example of embodiment of the invention

[0026] Other characteristics and advantages will emerge from the following description of the invention, a description given by way of example only, referring to the appended drawings in which:

[0027] [Fig-1] [Fig. 1] represents the reference profile of a diamond

[0028] [Fig.2] [Fig.2] represents a top view of the table of a composite stone according to the invention

[0029] [Fig.3] [Fig.3] represents a top view of the table of a composite stone in regular octagon shape according to a variant of the invention. General principle of the invention

[0030] [Fig.2] represents the top view of a composite stone table according to the invention. It is constituted by four identical elementary stones (100, 200, 300, 400) whose assembly forms the table has an octagonal shape (table of a brilliant-cut diamond), with eight sides formed alternately by the outer edge (110, 210, 310, 410) of the elementary stones (100, 200, 300, 400), and by two adjacent cut sides (121, 220; 221, 320; 321, 420 421, 120). The length 1 of a cut face (120, 121, 220, 221, 320, 321, 420, 421) is preferably equal to half the length L of an outer edge (110, 210, 310, 410) of the elementary stones (100, 200, 300, 400) such that the length L2 of the face of the table formed by two adjacent cut faces is equal to the length L of a face of the octagon formed by the outer edge of an elementary stone.

[0031] The angle formed by the two adjacent edges of the table of each elementary stone (100, 200, 300, 400) is 90° so that the elementary stones (100, 200, 300, 400) can be joined to form a composite stone having the optical characteristics of a monolithic stone.

[0032] Thus, by using four elementary stones (100, 200, 300, 400) cut in this way, an octagon is formed which reconstitutes the table of a classic round diamond (brilliant cut). The table being the most important facet, the savings made are just as important.

[0033] All other smaller facets are more or less triangles or rhombuses and can each be fitted with one or more fitted cut stones (in triangle and / or rhombus or other already known cut)

[0034] The advantage of this invention is to have a visual and a rendering close to that of a single stone.

[0035] The table is made up of an assembly of four cut stones, of which [Fig.2] represents an example of realization. Elemental Stone Configuration

[0036] An elementary stone has a hexagonal table (111) and an assembly of 3 facet triplets (112 to 114) surrounding the table (111). These three triplets are each extended by a crown facet (123 to 125). Diamond-shaped stones (131, 132) form the three corners of the crown. Assembly forming a cut of a round stone

[0037] [Fig.3] represents a top view of a composite stone formed by the assembly of four elementary table stones which define an octagonal outline and have four stones (150, 250, 350, 450), which reconstitute the table of a classic round diamond (500).

Claims

Claims

1. Composite ornamental piece, characterized in that it comprises a composite stone table consisting of four identical elementary stones (100, 200, 300, 400) whose assembly has an octagonal shape and in that all the other smaller facets are triangles or diamonds each adjusted with one or more cut stones.

2. Ornamental piece, according to claim 1, characterized in that the table of the faceted body is an octagon and has four facets (150, 250, 350, 450), which reconstitute the table of a classic round diamond (500).

3. Ornamental piece, according to claim 1, characterized in that the facets other than those formed by said four stones have a triangle or diamond shape and each fitted with one or maximum two stones in the shape of a triangle or a diamond.

4. Ornamental piece, according to claims 1 and 2, characterized in that the facets have at least two different colors.

5. Ornamental piece, according to claim 1, characterized in that it has a pavilion formed by assembling facets meeting in the collar or in the top of the pavilion.

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