JP2004194778A - Diamond and diamond cutting method - Google Patents

Abstract

An object of the present invention is to cut a diamond so that a cut pattern on the pavilion side can be visually recognized from a crown side by using a pavilion side that has not been used for cutting.
In a pavilion, the tops of five square surfaces are gathered at the bottom of the pavilion, and adjacent square surfaces share a lower side, and the square surface is a girdle portion as a reference surface. The angle formed with respect to the reference plane is 40.5 degrees to 41.5 degrees, and 10 sides which share one side with the upper side of this quadrilateral surface and share one side with every other adjacent triangular surface The angle formed by the triangular surface with respect to the reference surface is 41.5 degrees to 42.5 degrees, and the girdle and the crown opposing the flat portion of the crown are in contact with every other adjacent quadrangular surface. The angle formed by the ten square surfaces with respect to the reference surface is 33.0 degrees to 35.0 degrees, and the depth is 55% to 65% of the diameter of the girdle portion.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a diamond cutting method and a novel diamond design formed by the cutting method.When the diamond rough is cut into a specific shape by using the properties of diamond, when viewed from the crown side, The cutting shape formed on the pavilion side emerges there.
[0002]
[Prior art]
Conventionally, diamond cut is based on a 58-hedron cut called a round brilliant cut, and a polyhedral cut is made on the crown side to mainly shine the crown side, and no decorative cut is made on the pavilion side Was.
[0003]
[Problems to be solved by the invention]
Conventional 58-hedral cuts are reasonably popular, and in some sense are appropriate in the sense that they make the diamonds shine, but the same cuts are applied uniformly. Therefore, at present, each diamond has only a difference in size due to lack of freshness.
[0004]
In other words, in order to bring out the freshness of the diamond cutting method, the pavilion side, which was not used in the past, is also cut, and if it is made to emerge as a pattern on the crown side, it will definitely be Different diamond designs can be offered.
[0005]
However, even if the pavilion side is simply cut, the characteristics of the diamond are not so simple that it emerges as a pattern on the crown side, and the pavilion side and the crown side have a cut shape, or the pavilion side cut pattern and the crown side flat part Unless the size of the girdle, the diameter of the girdle part and the ratio of the depth, etc. are within a certain range, a beautiful pattern cannot be obtained.
[0006]
[Means for Solving the Problems]
Therefore, in the diamond according to the present invention, at the bottom of the pavilion, the tops of five squares of the same shape are gathered, and the adjacent squares share one lower side, and each square is formed by a square. When the girdle part is used as a reference plane, the angle formed with respect to this reference plane is 40.5 degrees to 41.5 degrees. When the surface of each of the ten triangles having one side common to the surface of the above is the girdle portion as a reference surface, the angle formed with respect to this reference surface is 41.5 degrees to 42.5 degrees, and the plane of the girdle and the crown is formed. In the case where ten square faces each having a common side with the square face adjacent to every other portion and having a common side with every other top face, the girdle portion is used as a reference face, and the angle formed with respect to this reference face is 33.0. Degrees to 35.0 degrees , Depth is obtained by 55% to 65% of the diameter of the girdle portion.
[0007]
In the diamond cutting method according to the present invention, when cutting a rough diamond into a diamond, the girdle portion is first formed into a perfect circle, and then the pavilion side is divided into ten equal parts, and the adjacent fan-shaped surfaces are formed on both sides. Are common, and when the fan-shaped surface is the girdle part as a reference plane, the angle formed with respect to this reference plane is 41.5 to 50.0 degrees, and the girdle part is cut so as to be an arc portion of each fan-shaped surface. Then, the line connecting the center of the ridge line and the point where the other ridge line contacts the girdle part every other edge is one side of the triangular surface, and the other two sides are common with the adjacent triangular surface and each side is common. When each triangular surface has a girdle part as a reference surface, the angle formed with respect to this reference surface is cut so as to be 41.5 degrees to 42.5 degrees, and ten triangular surfaces are cut. And cut the common part of the adjacent triangular faces with the common short sides into square faces so that the tops of the five square faces gather at one point at the bottom, and When the surface is a girdle portion as a reference surface, five square surfaces are formed so that the angle formed with respect to this reference surface is 40.5 degrees to 41.5 degrees, and then the same as the pavilion side on the crown side When the adjacent fan-shaped surfaces which are equally divided at the position and which are adjacent to each other have both sides in common and the fan-shaped surface is a girdle part as a reference surface, an angle formed with respect to this reference surface becomes 34.0 degrees to 40.0 degrees. Cut so that the girdle part becomes the arc part of each fan-shaped surface, and then a line connecting every other quarter from the girdle part of the ridge line and the point where the other ridge line contacts the girdle part is a triangular surface One side and the other two sides When the sides of the triangular surface in contact with the triangular surface are in common and each triangular surface has a girdle portion as a reference surface, the angle formed with respect to this reference surface is 33.0 degrees to 35.0 degrees. In a plan view of a star-shaped pentagon formed by forming ten triangular faces and forming a flat part at a position 55% to 65% of the diameter of the girdle part by the square face at the bottom of the pavilion. Cut so that the outer diameter and the diameter of the plane portion of the crown are substantially equal, and then form a triangular surface at a common point on the side of the adjacent triangular surface so that this flat portion becomes a decagon, and the flat portion is The surface is cut into a decagon so that each of the ten triangular surfaces becomes a quadrilateral surface C.
[0008]
[Action]
The surface of the pavilion side and the crown side are each cut at such an angle, and the size of the cut at which the bottom of the pavilion side is formed in a star shape in plan view and the size of the plane portion on the crown side are substantially the same. By making the diameter of the girdle part and the ratio of the depth into such a range, when viewed from the plane part on the crown side, the pentagonal star at the lowest part of the pavilion side just inscribes the decagon of this plane part. Will look beautiful.
[0009]
This is a result of utilizing the refractive index of diamond, and unless each surface is cut at such an angle, the cut pattern at the bottom of the pavilion side will not clearly emerge on the plane portion on the crown side. In addition, the size and depth of the crown-side flat portion affect the range of the size of the cut pattern at the lowest part of the pavilion side seen from the crown-side flat portion, but the basic appearance, that is, the cut pattern from the crown side Since it does not affect whether or not they can be seen, the angle may not be as precise as the angle between the surfaces.
[0010]
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Next, an embodiment of a diamond cutting method and a diamond according to the present invention will be described with reference to the drawings.
First, a rough diamond cut into an appropriate size is cut like a normal cutting so that the girdle part 1 becomes a perfect circle.
[0011]
Next, the pavilion side is divided into ten equal parts to form ten fan-shaped surfaces. That is, when the adjacent fan-shaped surfaces have both sides in common and the fan-shaped surface is the girdle portion 1 as a reference surface, the angle formed with respect to this reference surface is 41.5 degrees to 50.0 degrees, and the girdle portion 1 Cut so as to form an arc on each sector. The angle is not so strict because only a part of the fan-shaped surface on the side in contact with the girdle part 1 remains and the other is cut in the next stroke.
[0012]
Next, when the girdle portion 1 is used as a reference plane, ten triangular faces B are formed so that the angle formed with respect to this reference plane is 41.5 degrees to 42.5 degrees. In other words, the line connecting the center of every other ridge line and the point where the other ridge line contacts the girdle part 1 is one side of the triangular surface B, and the other two sides are common to the adjacent triangular surface B. In addition, when each of the triangular surfaces B uses the girdle part 1 as a reference plane, the cut is made so that the angle formed with respect to this reference plane is 41.5 to 42.5 degrees.
[0013]
Then, when the girdle part 1 is used as a reference plane, five square faces A are formed so that the angle formed with respect to this reference plane is 40.5 degrees to 41.5 degrees. That is, the portion of the adjacent triangular surface B having the common short side is common to the side of the triangular surface B, and is cut into a quadrilateral surface A so that the tops of the five quadrangular surfaces A at the bottom 2 are gathered at one point. Is cut so that the angle formed with respect to the reference plane is 40.5 degrees to 41.5 degrees.
[0014]
Next, the crown side is divided into ten equal parts at the same position as the pavilion side to form ten fan-shaped surfaces. That is, when the adjacent fan-shaped surfaces have both sides in common and the fan-shaped surface is the girdle portion 1 as a reference surface, the angle formed with respect to this reference surface is 34.0 degrees to 40.0 degrees, and the girdle portion 1 is Cut so as to form an arc on each sector. The angle is not so strict because only a part of the fan-shaped surface on the side in contact with the girdle part 1 remains and the other is cut in the next stroke.
[0015]
Then, when the girdle part 1 is used as a reference plane, ten triangular faces are formed so that the angle formed with respect to this reference plane is 33.0 degrees to 35.0 degrees. This will later be a square face C. In other words, a line connecting approximately one-fourth of the edge of the girdle portion 1 from the girdle portion 1 and a point at which the other edge line contacts the girdle portion 1 forms one side of the triangular surface, and the other two sides form the adjacent triangular surface. When the sides are common and each triangular surface is the girdle portion 1 as a reference surface, the cut is made so that the angle formed with respect to this reference surface is 33.0 degrees to 35.0 degrees.
[0016]
Then, the plane portion 3 is formed so that the depth is 55% to 65% of the diameter of the girdle portion 1. That is, the outer diameter of the star-shaped pentagon formed by the quadrangular surface A of the lowermost portion 2 of the pavilion at the position of 55% to 65% of the diameter of the girdle portion 1 and the plane of the crown in the plane portion 3 Cut so that the diameter of the part 3 becomes substantially equal.
[0017]
Next, ten quadrangular surfaces C are formed between the girdle part 1 and the flat part 3 so that the flat part 3 becomes a decagon. That is, a triangular surface is formed at a common portion of the sides of adjacent triangular surfaces, and the plane portion 3 is cut so as to have a decagonal shape and each of the ten triangular surfaces has a quadrangular surface C.
[0018]
When the girdle part 1 is used as a reference plane, the angle formed by each plane with respect to this reference plane is as follows. When the angle of the square surface A is 41.5 degrees, the triangle surface B is 42.5 degrees and the square surface C is 33.0 degrees. On the other hand, when the angle of the plane A is 40.5 degrees, the plane B of the triangle is 41.5 degrees and the plane C of the square is 35.0 degrees.
[0019]
When the rough diamond is cut as described above, the diamond of the present invention is formed. As a result of cutting into such a shape, when viewing the pavilion side from the crown-side flat portion 3, the square surface A on the pavilion side looks just like a star as shown by the dotted line in FIG. Incidentally, the diamond of the present invention is not limited to those cut by the above-described process, and any diamond cut by any process as long as the diamond satisfies predetermined requirements as a result. Needless to say, it holds as a diamond.
[0020]
The depth is set to be 55% to 65% of the diameter of the girdle part 1. However, depending on the size of the plane part 3, when the depth is increased, the star shape tends to protrude from the plane part 3, and when the depth is reduced, Since the entire star shape may not be able to fit in the flat portion 3 in some cases, it is desirable to adjust these appropriately.
[0021]
In the above-described embodiment, the plane A is formed into a pentagon with the star A being a pentagon with five squares A of the bottom 2 being a pentagon. However, the number of corners of the bottom 2 is not limited to this pentagon, and is not limited to this pentagon. It may be square. Also, the plane portion 3 may be any polygonal shape. However, when the number of the quadrangular faces A of the bottommost portion 2 is N, the number of the triangular faces B and the number of the quadrangular faces C are 2N, and the angles of the respective faces need to be within a prescribed range.
[0022]
【The invention's effect】
As described above, in the diamond according to the present invention, at the bottom of the pavilion, the tops of five squares of the same shape are gathered, and the adjacent squares have a common lower side. When the surface of each square is the girdle part as a reference surface, the angle formed with respect to this reference surface is 40.5 degrees to 41.5 degrees, and the upper side of each surface of the squares and the side are common and one In the case where the surface of each of ten triangles having one side in common with the surface of every other triangle is the girdle part as a reference plane, the angle formed with respect to this reference plane is 41.5 degrees to 42.5 degrees, and When the tops of the girdle and the crown opposing the plane portion are in contact with each other, and every other square surface that is adjacent to each other has a common side, ten square surfaces each having a common side make the girdle portion a reference surface. Angle is 33.0 degrees to 3 And the depth is 55% to 65% of the diameter of the girdle part. Therefore, when viewed from the plane part on the crown side, the star-shaped pattern at the bottom of the pavilion side is exactly the same as the decagon in the plane part. It has the effect of appearing to be inscribed in the diamond and giving the diamond a feeling completely different from the round brilliant cut of the conventional diamond.
[0023]
Further, according to the diamond cutting method of the present invention, the diamond of the present invention can be formed by sequentially cutting each surface of the pavilion side and the crown side at a predetermined angle.
[Brief description of the drawings]
FIG. 1 is a plan view of a diamond of the present invention.
FIG. 2 is a bottom view of the diamond of FIG. 1;
FIG. 3 is a left side view of the diamond of FIG. 1;
FIG. 4 is a right side view of the diamond of FIG. 1;
5 is a front view and a rear view of the diamond of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Girdle part 2 Bottom part 3 Plane part A Square surface at the lowest part of pavilion side B Triangular surface C in contact with square surface at the lowest part of pavilion side C surface

Claims (6)

A diamond characterized in that the diamond cut satisfies the following requirements (1) to (3).
{Circle around (1)} At the bottom of the pavilion, the tops of five squares of the same shape are gathered, and the adjacent squares have a common lower side, and the squares form a girdle part. In the case where the reference plane is used, the angle with respect to the reference plane is 40.5 degrees to 41.5 degrees.
{Circle around (2)} The upper side of each of the quadrangular surfaces and the side are common, and every other triangular surface adjacent to every other triangular surface has the same side as the ten triangular surfaces, with the girdle part as the reference surface. In this case, the angle formed with respect to the reference plane is 41.5 degrees to 42.5 degrees.
{Circle around (3)} When the tops of the girdle and the crown opposing the plane portion of the crown are in contact with each other, and every other square surface adjacent to every other square surface has one side in common, the girdle portion is the reference surface, The angle with respect to this reference plane is 33.0 degrees to 35.0 degrees, and the depth is 55% to 65% of the diameter of the girdle part. The outer diameter in a plan view of a star-shaped pentagon formed by the square surface at the bottom of the pavilion and the diameter of the flat portion of the crown are almost equal, the flat portion of the crown is a decagon, and the flat portions of the girdle and the crown. 2. The diamond according to claim 1, wherein the apex on the flat surface side of the quadrangular surface with which the apex opposite to the abutment is in contact at the center of each side of the decagon. A diamond cutting method characterized by passing through the following steps (1) to (8) when cutting a rough diamond into a diamond.
(1) The girdle part is formed in a perfect circle.
{Circle around (2)} The pavilion side is divided into ten equal parts, and the adjacent fan-shaped surfaces have both sides in common, and when the fan-shaped surface has the girdle portion as a reference surface, the angle formed with respect to this reference surface is 41.5. Degrees to 50.0 degrees, and cut so that the girdle part becomes an arc part of each sector-shaped surface.
(3) The line connecting the center of every other ridge line and the point where the other ridge line contacts the girdle part is one side of the triangular surface, and the other two sides are common to the adjacent triangular surface. Then, when each triangular surface is a girdle part as a reference surface, cut so that the angle formed with respect to this reference surface is 41.5 degrees to 42.5 degrees to form ten triangular surfaces. To do.
{Circle around (4)} Triangular faces that share common sides are cut into quadrangular faces on adjacent triangular faces with common short sides, so that the tops of the five quadrangular faces at the bottom are gathered at one point, and When the surface is a girdle portion as a reference surface, five square surfaces are formed so that an angle with respect to the reference surface is 40.5 degrees to 41.5 degrees.
(5) The crown side is also divided into ten equal parts at the same position as the pavilion side, and the adjacent fan-shaped surfaces have the same sides on both sides, and the fan-shaped surface has the girdle part as the reference surface. Cut so that the angle formed becomes 34.0 degrees to 40.0 degrees, and the girdle part becomes an arc part of each fan-shaped surface.
(6) Every other edge is a quarter of the edge of the girdle, and a line connecting the point where the other edge contacts the girdle is one side of the triangle, and the other two sides are adjacent triangles. In the case where the surface and each side are common, and each triangular surface has a girdle portion as a reference surface, cut so that the angle formed with respect to this reference surface is 33.0 degrees to 35.0 degrees. To form triangular faces.
{Circle around (7)} A crown-side flat portion is defined by a star-shaped pentagon formed by the square surface at the bottom of the pavilion at a position where the depth is 55% to 65% of the diameter of the girdle portion. Cut so that the diameter is almost equal to the diameter of the flat part of the crown.
{Circle around (8)} A triangular surface is formed at a common portion of sides of adjacent triangular surfaces so that the planar portion becomes a decagon, and the planar portion becomes a decagon, and each of the ten triangular surfaces is a quadrilateral surface. Cut to become. A diamond characterized in that the diamond cut satisfies the following requirements (1) to (3).
{Circle around (1)} At the bottom of the pavilion, an arbitrary number of tops of squares of the same shape are gathered. Adjacent squares have a common lower side, and each square has a girdle part. In the case where the reference plane is used, the angle with respect to the reference plane is 40.5 degrees to 41.5 degrees.
{Circle around (2)} The upper side of each of the quadrangular faces is made to have a common side, and the sides of every other adjacent triangle are made to have a common side, and the number of triangles is twice the number of the aforementioned quadrangular faces. When the surface is a girdle portion as a reference surface, the angle formed with respect to this reference surface is 41.5 degrees to 42.5 degrees.
{Circle around (3)} The number of the squares at the bottom of the pavilion side being twice the number of the squares at the bottom of the pavilion, where the tops of the girdle and the crown opposing the planes are in contact with each other, and the sides of the squares adjacent to every other square are also common. When the square surface has the girdle portion as a reference surface, the angle formed with respect to this reference surface is 33.0 degrees to 35.0 degrees, and the depth is 55% to 65% of the diameter of the girdle portion. 5. The diamond according to claim 4, wherein the outer diameter of the star-shaped pentagon formed by the square surface at the bottom of the pavilion in plan view is substantially equal to the diameter of the plane portion of the crown. The plane portion of the crown is a polygon twice as many as the number of squares at the bottom of the pavilion, and the top of the square surface where the tops facing the flat portion of the girdle and the crown are in contact with each other is a polygon. 6. The diamond according to claim 5, which is in contact at the center of the side.

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