JP3181566B2 - Decorative ball cut - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a decorative ball.

[0002]

2. Description of the Related Art Most of precious and semi-precious stones (hereinafter, jewels) such as diamond, ruby, and sapphire are finished into decorative balls suitable for decoration by cutting a rough. In that case, the rough is cut so that the jewel can be most beautifully viewed in consideration of the crystal structure and the like of the jewel.

FIG. 6 illustrates a conventional cut. FIG.
(A) is a figure showing a round brilliant cut. This cut is known as the diamond's brightest cut and is often used to cut diamonds.

FIG. 6B is a diagram showing an oval brilliant cut. This cut is a variant of the round brilliant cut. Marquise, heart shape,
There is a deformation such as a pair shape.

FIG. 6C shows a princess cut. FIG. 6D shows a Flanders cut. FIG. 6E shows a marigold cut. This cut is often used for rough stones with relatively small thickness.

FIG. 6F is a diagram showing a square emerald cut. This cut is often used for emeralds. FIG. 6G is a diagram showing the Ceylon cut. This cut is often used for sapphire and ruby. Rough sapphire and ruby are often obtained in a shape close to an oval with sharp corners. For this reason, cuts are made so that trapezoids are stacked at the lower part (pavilion) of the cut so as to make use of the size of the rough. A cut in which the trapezoidal facets are stacked is called a step cut. The Ceylon cut also has a deformation such as an oval (not shown).

[0007]

FIG. 7 is a view for explaining a procedure for cutting out a round brilliant cut decorative ball from a rough diamond.

FIG. 7A is a view showing an example of the shape of a rough diamond. As shown in FIG. 7A, the rough diamond 100 is generally obtained as an octahedral crystal. In order to cut out a round brilliant cut decorative ball shown in FIG. 6A from this octahedron, a rough stone is cut by a procedure as shown in FIGS. 7B and 7C.

First, as shown in FIG. 7B, a rough octahedron 100 is divided into two pieces, a crystal piece 101 and a crystal piece 102.
Get. FIG. 7C is a view of the crystal piece 102 shown in FIG. As shown in FIG. 7 (c), a round brilliant cut decorative ball is cut out in accordance with the bottom surface of the downwardly facing quadrangular pyramid forming a part of the crystal piece 102. The ornamental ball obtained by this cutting has the largest case having a circular girdle inscribed in the bottom surface of the quadrangular pyramid. Therefore, in the round brilliant cut, there is a problem that only a small decorative ball can be obtained for the size of the rough.

When it is desired to cut out a larger decorative ball utilizing the octahedron, which is the shape of a rough diamond, polygonal cuts such as a princess cut, a Flanders cut and a square emerald cut are sometimes used. However, decorative balls such as princess cuts and square emerald cuts are large but have a problem that they do not shine very well.

In general, when the decorative ball is placed on the metal, the decorative ball is fixed to the metal by providing claws. When the nails are provided, the area for the decorative balls to cover the decorative balls should be minimized so that the decorative balls are not hidden by the nails. Further, the nails are designed to be small and small so that the nails do not impair the beauty of the ornament.

FIG. 8 is a diagram showing an example of a case where circular decorative balls are closely arranged. FIG. 8A shows a case where the circular decorative balls 103 are arranged in a line in close contact with each other.
(B) shows an example in which two or more rows are closely arranged. As shown in FIG. 8A, even if the circular decorative balls 103 are arranged in one row, a gap is formed between the circular decorative balls 103. In such an arrangement, the circular ornamental ball 10
In order to fix 3 to the bullion, the nail 104 is
Often provided above and below.

Further, when the decorative balls are fixed to the base metal in an arrangement as shown in FIG. 8B, a claw 105 is often provided at a portion where the four decorative balls 103 are closest to each other. Since the decorative balls 103 are circular, the portions where the decorative balls are in contact with each other are dots, and the gap formed between the four decorative balls 103 is large. Therefore, there is a problem that a relatively large claw 105 must be used to fix the four decorative balls 103 to the base metal.

Further, since the gap formed between the four decorative balls 103 becomes large, there is a problem that the metal can be seen from the gap between the decorative balls 103. FIG. 9 shows an example in which square and octagonal decorative balls are arranged. FIG. 9 (a)
Shows an example in which square decorative balls are closely arranged in a row. As shown in FIG. 9 (a), a square decorative ball 106 is formed by making one side close to an adjacent decorative ball.
Arranged in columns. There is no gap between the decorative balls 106. In order to fix the decoration ball 106 to the base metal, claws 107 are provided above and below the decoration ball 106.

In the case where the square decorative balls 106 are arranged in two rows in close contact, the decorative balls other than the decorative balls located at both ends must be in close contact with the decorative balls whose three sides out of four sides are adjacent to each other. become. When three or more rows are arranged, all four sides are in close contact with adjacent decorative balls. For this reason, there is no place where the nail is provided. Therefore, there is a problem that two or more rows of square decoration balls cannot be closely arranged.

FIGS. 9B and 9C show examples in which regular octagonal decorative balls are closely arranged in one or more rows. As shown in FIGS. 9B and 9C, the regular octagonal decorative balls 108 are arranged in one row and two or more rows with one side close to an adjacent decorative ball. Since there is a gap between the decorative balls 108, a claw 109 or a claw 110 can be provided in the gap. However, some nail size was still required.

An object of the present invention is to provide a decorative ball that can be cut out from a rough stone and that shines well. SUMMARY OF THE INVENTION An object of the present invention is to provide a decorative ball in which a gap between decorative balls is not increased when the decorative balls are closely arranged.

An object of the present invention is to provide a decorative ball that can be easily fixed to a base metal with small claws when the decorative ball is closely arranged.

[0019]

According to the present invention, in order to solve the above-mentioned problems, in a decorative ball, a girdle has an outer shape obtained by cutting each vertex of a polygon by an arc. This makes it possible to bring the linear portions of the girdle of the plurality of decorative balls into close contact with each other, and to provide claws in the gaps formed between the curved portions of the girdle. Since the curve is an arc, the gap is narrow. Therefore, it is possible to reduce the size of the nail. Further, since the gap is narrow, the problem that the metal can be seen from the gap is also solved.

The polygon can be a quadrangle. Further, the polygon may be a square, and the central angle corresponding to the arc may be 45 degrees. Thereby, when the rough diamond is an octahedron, it is possible to cut out a large decorative ball utilizing its shape.

In the case where the polygon is a square and the central angle corresponding to the arc is 45 degrees, the table may be a square formed by straight lines parallel to each straight line portion of the girdle. Is also possible. It is also possible to make the length of one side of the table the same as the length of the linear part of the girdle. Thereby, most of the outer shape of the girdle of the decorative ball according to the present invention overlaps with the outer shape of the round brilliant cut or ceylon cut girdle, and the table of the decorative ball according to the present invention is a round brilliant cut or ceylon cut table. And the large area overlaps. Therefore, when the decorative ball according to the present invention is cut out from the round brilliant cut or Ceylon cut decorative ball by recutting, it is possible to reduce a decrease in the size of the original decorative ball.

Furthermore, the facet of the part corresponding to the arc portion of the girdle in the pavilion of the decorative ball can be made common to the facet of the pavilion of the round brilliant cut. Thereby, it is possible to reduce a decrease in the size of the decorative ball due to the recut described above. In addition, it is possible to obtain a decorative ball that shines well.

Further, it is possible to make a step cut on the pavilion of the decorative ball according to the present invention.
The step cut can be performed on a part or the whole of the pavilion. Thereby, even when cutting out the decorative ball according to the present invention from the rough, even when cutting out the decorative ball according to the present invention by recutting the cut decorative ball, the original rough or By utilizing the shape of the decorative ball, a large decorative ball according to the present invention can be obtained.

Furthermore, the pavilion angle of the decorative ball can be between 38 degrees and 42 degrees. The crown angle of the decorative ball can be between 30 degrees and 38 degrees. With such an angle, when the ornamental ball is diamond or a jewel having a critical angle close to diamond, it is possible to increase the brightness of the ornamental ball.

[0025]

FIG. 1 is a view showing a decorative ball according to a first embodiment of the present invention. FIG. 1A is a front view,
FIG. 1B is a plan view, and FIG. 1C is a bottom view. The rear view, left side view and right side view appear the same as the front view.
The decorative ball 1 according to the present embodiment includes a girdle 2, a crown 3, a pavilion 4, a curette 5, and a table 6. The girdle 2 is an outer periphery of the ornamental ball that separates between the crown 3 that is the upper portion of the ornamental ball and the pavilion 4 that is the lower portion of the ornamental ball. When the decorative ball 1 is set on the table, the girdle 2 is held with claws. Curette 5
Is a lowermost protruding end of the decorative ball 1, and is often provided with a small surface (facet). Table 6
A large facet located at the top of the crown 3.

Among the facets constituting the crown 3, a facet 7 having a shape similar to a western kite is called a kite facet or a bezel facet. Among the facets constituting the pavilion 4, the facet 8 extending from the girdle 2 to the curette 5 is called a main pavilion facet.

As shown in FIG. 1, and in particular, FIGS. 1B and 1C, the decorative ball 1 according to the present embodiment comprises a girdle 2.
Is an outer shape obtained by cutting each vertex of a polygon by an arc. More specifically, the arc is located on the circumference with the center of the table 6 as the center of the circle. The polygon is, for example, a quadrangle. In FIG. 1, the square is a square, and the central angle corresponding to the arc is 45 degrees.

In FIG. 1A, the angle between the girdle 2 and the bezel facet 7 is called a crown angle, and the angle between the girdle 2 and the main pavilion facet 8 is called a pavilion angle. Each material has a critical angle. In general, light rays incident from an optically dense medium to a sparse medium at an angle of incidence greater than a critical angle with respect to a boundary surface are totally reflected. Here, total reflection refers to a phenomenon in which light rays are totally reflected without entering a sparse medium. When the rough is sufficiently large, the crown angle and the pavilion angle are provided such that light rays incident from above the ornamental ball are reflected upward and light rays incident from below are transmitted upward, paying attention to this critical angle. Often. When the decorative ball 1 is diamond, the crown angle is between 30 degrees and 38 degrees, and the pavilion angle is between 38 degrees and 4 degrees.
It shines best when it is between two degrees.

There are a number of considerations that should be taken to ensure that the diamond decoration ball shines well. The above-mentioned crown angle and pavilion angle are one of them. A further consideration is the facets of the pavilion.

As shown in FIG. 1 (c), the decorative ball pavilion 4 according to the present embodiment has a facet forming a star shape having four vertices. The facets forming this star have facets facing each other. Since it is a square star, there are two facing facets.

It is assumed that a light ray enters one of the facets forming a square star from the crown side of the decorative ball. This facet reflects an incident light beam towards the opposite facet. The reflected light incident on the facing facets is further reflected again to return to the crown side of the decorative ball. That is, the light beam incident from the crown side is reflected so as to return to the crown side again. Here, the facet pairs facing each other have a common axis. The facets are symmetrical about this axis. Thus, the rays do not distort when reflected twice at the facing facets. Therefore, the decorative ball according to the present embodiment returns the light incident from the crown to the crown again, and furthermore, the reflected light is sharp because the light is not distorted.

In general, a ray reflected by a facet having an acute angle gives a visually stronger impression than a ray reflected by a facet having many obtuse angles.
The facets of the pavilion described above have acute angles. Therefore,
As compared to conventional polygonal cuts, such as emerald cuts and marigold cuts, the decorative balls according to the present embodiment shine better.

FIG. 2 shows that a rough stone can be cut out.
It is a figure explaining the size of the ball for decoration concerning this embodiment. As an example, the case of a rough diamond will be described. Diamond crystals are usually octahedral. The octahedron has a shape such that the bottom sides of two square pyramids are stuck together. The diameter of the girdle of the decorative ball needs to be within the bottom of the square pyramid. In FIG. 2, a square 10 indicates a base of a quadrangular pyramid that constitutes a part of the crystal octahedron. A circle 11 indicated by a dotted line inscribes the square 10. This circle 1
Reference numeral 1 denotes the outer shape of a girdle of a round brilliant cut decorative ball obtained from a crystal. A figure 12 shown by a solid line shows the outer shape of the decorative ball according to the present embodiment obtained from a crystal. As shown in FIG. 2, the decorative ball according to the present embodiment has a shape in which each vertex of a square is cut out in a circular arc. Therefore, according to the present invention, it is possible to cut out a decorative ball larger than a conventional round brilliant cut by making use of the size of the square 10 representing the outer shape of the crystal. Calculations show that if the most ideal diamond gemstone is most ideally processed, then a normal round brilliant cut ornamental ball is about 0.8
Approximately 1 carat can be cut from a rough stone that can be cut out of only 78 carats if it is a decorative ball according to the present embodiment. Therefore, it is possible to make use of the size of the rough diamond to obtain a larger decorative ball than before. In addition, the above-mentioned feature is not limited to the rough diamond, but applies to all rough stones of the same shape.

In general, gemstones vary in quality. The quality refers to the presence or absence of the color of the rough, the beauty of the color, the presence or absence of impurities, and the presence or absence of scratches. This quality is not exactly known until you cut the rough. For this reason, they sometimes buy ornamental balls that have been cut and of which quality is clear, rather than purchasing them as raw stones. However, the cut decorative balls often do not have the shape desired by the purchaser. In that case, the cut decorative ball is cut again (hereinafter, recut) so as to have a desired shape. This method is often used for relatively small decorative balls.

FIG. 3 is an explanatory view in the case where the decorative ball according to the present embodiment is cut out by recutting. Here, a case where a round brilliant cut decorative ball is recut will be described as an example. FIG. 3A shows a crown of a round brilliant cut. FIG. 3B shows a crown of a decorative ball according to the present embodiment. FIG. 3 (c)
Shows a state in which the crown of the round brilliant cut and the crown of the decorative ball according to the present embodiment are overlapped.

In FIG. 3 (c), the vertices of the octagon forming the round brilliant cut table are defined clockwise as R1, R2, R3, R4, R5, R6, R7 and R8. As can be seen from FIG. 3 (c), the squares constituting the table 6 of the decorative ball 1 according to the present embodiment are:
The octagons R2, R4, R6, and R8 constituting the round brilliant cut table are defined as vertices.

Straight line R2-R4, straight line R4-R6, straight line R
S1, S2, S3, S4, S5, S6, S7, S
8 is assumed. Girdle 2 of decorative ball 1 according to the present embodiment
Are arcs S1-S2, chords S2-S3, arcs S3-S4,
String S4-S5, arc S5-S6, string S6-S7, arc S
7-S8 and strings S8-S1.

Since the round brilliant cut is one-eighth symmetric, the central angles corresponding to the arcs S1-S2, S3-S4, S5-S6 and S7-S8 are 45.
Degrees, strings S2-S3, strings S4-S5, strings S6-S7
And the strings S8-S1 have the same length. The table 6 is a square and the length of one side is the same as the length of the strings S2-S3, for example.

As described above, the girdle 2 of the decorative ball 1 according to the present embodiment is composed of straight lines and circular arcs, and the circular arcs constituting the girdle 1 are on the circumference with the center of the table at the center of the circle. Therefore, there are many portions that overlap with the circumference forming the girdle of the round brilliant cut.

Returning to FIG. 1C, the pavilion 4 of the decorative ball 1 according to the present embodiment will be described. FIG. 1 (c)
As shown in (1), in the decorative ball 1 according to the present embodiment, the facet of a portion of the pavilion 4 corresponding to the arc portion of the girdle 2 is the same as the facet of the pavilion of the round brilliant cut. On the other hand, the facets of the pavilion 4 corresponding to the linear portions of the girdle 2 are step-cut.

From the above description, when the decorative ball according to the present embodiment is cut out from the round brilliant cut decorative ball, the decorative ball according to the present embodiment is cut as much as possible without impairing the size of the round brilliant cut decorative ball. It is possible to cut out balls. Therefore, it is possible to reduce the decrease in the size of the decorative ball, which is the greatest disadvantage in recutting. According to the calculation, when the decorative ball according to the present embodiment is cut out by recutting the most ideal round brilliant cut decorative ball, the size reduction is about 7%.

In the design of jewelry such as a ring, a relatively small decorative ball rarely becomes a major part of the design by itself. Often used as one of the components of a design with other decorative balls. Therefore,
Although it is required for relatively large decorative balls,
In particular, a relatively small decorative ball is required to have a shape that can be easily fixed to a base metal using a small claw, and that also has a degree of freedom in a place where the claw is provided.

FIG. 4 is a view showing an example in which the decorative balls 1 according to the present embodiment are closely arranged. FIG.
(A) shows a case where they are arranged in one row, and FIG. 4 (b) shows a case where they are arranged in two or more rows.

As shown in FIGS. 4A and 4B, the linear portions of the girdle of the decorative ball 1 can be arranged close to each other. Therefore, like a conventional circular decorative ball,
Even if the decorative balls are closely arranged, no large gap is formed between the decorative balls, so that the decorative balls can be easily fixed to the base metal using small claws. In addition, the problem that the bullion is largely visible from the gap between the decoration balls is also solved.

Further, according to this embodiment, the gap between the decorative balls is formed by the curved portion of the girdle. The pawl is provided in this gap. As shown in FIGS. 4A and 4B,
According to the present invention, a gap for providing the claws 30 and 31 is formed even when the decorative balls are arranged in close contact with one or more rows. In the case of a square decorative ball, if it is arranged close to two or more rows,
There was a problem that a claw could not be provided because no gap was formed between the decorative balls, but such a problem does not occur in the decorative ball 1 according to the present embodiment.

Further, according to the decorative ball 1 according to the present embodiment, the decorative ball can be fixed by providing the claw in the small gap formed between the curved portions of the girdle 2. The gap formed by the arc of the girdle is
Smaller than conventional octagonal decorative balls. The small gap formed between the balls for decoration means that the claws appearing on the surface formed by the balls for decoration are small.
Therefore, it is possible to easily fix the decorative ball 1 to the base metal with nails smaller than the octagonal decorative ball.

FIG. 5 is a view showing a decorative ball according to the second embodiment of the present invention. FIG. 5A is a front view, and FIG.
5B is a plan view, and FIG. 5C is a bottom view. Rear view,
The left side view and the right side view appear the same as the front view. The decorative ball 21 according to the second embodiment also includes a girdle 22, a crown 23, a pavilion 24, a curette 25, and a table 26. The girdle 22, the crown 23 and the curette 25 are the same as the decorative ball 1 according to the first embodiment, but the pavilion 24 is different. The pavilion 24 of the decorative ball 21 according to the second embodiment has a step cut as a whole. In the Ceylon cut, the crown facets are similar to the round brilliant cut facets, but the pavilion has a step cut. The decorative ball 21 has many facets common to the above-mentioned Ceylon cut facets. Therefore, when the decorative ball is cut out by re-cutting from the Ceylon cut, the decorative ball 21 is cut more than when the decorative ball 1 is cut out.
In the case of cutting out, the decrease in the size of the decorative ball is smaller. Therefore, the decorative ball 21 according to the second embodiment of the present invention is particularly suitable for recutting a Ceylon cut decorative ball.

The decorative ball 21 according to the second embodiment is also provided with the advantages of the decorative ball 1 according to the first embodiment described above, for example, a large decorative ball can be cut out from a rough stone, and can be easily cut with a small claw. It has advantages such as being able to be fixed to a base metal and reducing the size of the ball for re-cutting compared to the original decorative ball.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various other modifications are possible. For example, in the embodiment of the present invention, a shape based on a circle has been described, but a case of recutting a brilliant cut of an oval and a ceylon cut of an oval is also included in the scope of the technical idea of the present invention. . In this case, the girdle curve of the decorative ball is an arc on the same ellipse, and the table is a rectangle.

[0050]

According to the present invention, it is possible to obtain a decorative ball that can be cut out from a rough stone and that shines well.

According to the present invention, it is possible to obtain a decorative ball that does not increase the gap between the decorative balls when the decorative balls are closely arranged. Further, according to the present invention, it is possible to obtain a decorative ball that can be easily fixed to a base metal with a small claw when the decorative ball is closely arranged.

Further, according to the present invention, even when the decorative ball already cut is recut, the decorative ball according to the present invention can be obtained while reducing the size of the original decorative ball. Becomes

[Brief description of the drawings]

FIG. 1 is a view showing a decorative ball according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating the size of a decorative ball according to the present invention, which can be cut out from a rough stone.

FIG. 3 is a diagram illustrating a case where a decorative ball according to the present invention is cut out by recutting.

FIG. 4 is a view showing an example of a case where decorative balls according to the present invention are closely arranged.

FIG. 5 is a view showing a decorative ball according to a second embodiment of the present invention.

FIG. 6 is a diagram showing an example of a conventional cut.

FIG. 7 is a diagram illustrating a procedure for cutting out a round brilliant cut decorative ball from a rough diamond.

FIG. 8 is a diagram showing an example of a case where circular decorative balls are closely arranged.

FIG. 9 is a diagram showing an example of a case where square or octagonal decorative balls are closely arranged.

[Explanation of symbols]

 1,21 Decorative ball 2,22 Girdle 3,23 Crown 4,24 Pavilion 5,25 Curette 6,26 Table 7 Bezel facet 8 Main pavilion facet 10 Square 11 Circle 12 Shape of decorative ball according to the present invention 30, 31 Claws R1, R2, R3, R4, R5, R6, R7, R8 points S1, S2, S3, S4, S5, S6, S7, S8 points

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A44C 1/00-3/00 A44C ⁷ /00-27/00 B24B 9/16 B28D 5/00

Claims (2)

(57) [Claims] 1. A decorative ball, comprising: a square table formed by connecting every other octagonal vertex of a brilliant-cut or ceylon-cut table; and the brilliant-cut or ceylon-cut girdle. And a girdle of a line segment parallel to each side of the rectangle, formed between the girdle of the line segment and each side of the square table, and between the girdle of the line segment and the curette. A decorative ball, characterized by having a step cut at a portion thereof. 2. A method of recutting a brilliant-cut or ceylon-cut decorative ball, comprising forming a square table by connecting every other octagonal vertex constituting the table of decorative balls, Cutting off the girdle of the decorative ball so as to form a girdle of a line segment parallel to each side of the square, between the formed girdle and each side of the square table and the formed girdle Performing a step cut on a facet between the facet and the culet.