Diamond faceting

FIELD: process engineering.

SUBSTANCE: invention is intended for use in production of jewellery. Proposed method consists in diamond site shaping to cone with cone generatrix angle to girdle plane. Diamond faceting features the following parameters: diamond diameter D, total height H=0.61D, cone base d=0.52D, girdle depth r=0.04D, top height with girdle h1=0.22D, bottom height to girdle h2,=0.39D, inclination of top faces to girdle plane 23.5°, bottom inclination to girdle plane 38.5°, cone generatrix inclination to girdle - 17°.

EFFECT: perfected diamond dye play.

1 dwg

 

The invention relates to the processing of diamond crystals and can be used in the diamond manufacturing industry.

Known cut diamonds with geometry, calculated M Tolkowsky providing optimal light game and luster of diamond [1].

The disadvantages specified cut can be attributed to weak color game of the diamond.

Known invention "Method for color cut diamond", patent No. 2453256, priority from 18.08.2008,

The disadvantages of this method include low color game of the diamond and the difficulty in accurately performing all of the geometric dimensions of the diamond.

It is known that when light travels from one medium to another is the refraction of the rays. The refractive index N=sinα/sinβ, where α is the angle between the perpendicular to the plane of the partition and the incident beam, and β is the angle between the refracted ray and the normal to the plane of the partition. Light rays entering perpendicular to the ground, almost not refracted and five internal reflection of the light flux does not give the desired effect.

The challenge, which seeks the claimed technical solution is to increase the color game of the diamond.

The result provided the solution to this problem is that you created a way to cut a diamond, in which the area of a diamond in the Supplement in the form of a cone, with the angle of the generatrix of the cone to the plane of the girdle, equal to 17 degrees, with the specified cut provides the following options:

diamond diameter D;

the total height H=0,61 D;

the size of the base of the cone d=0,52 D;

the thickness of the girdle r=0,04 D;

the height of the top of the girdle h1=0,22 D;

the height of the bottom to the girdle h2=0,39 D;

the angle of the sides of the top to the plane of the girdle 23,5°;

the angle of inclination of the faces of the bottom to the plane of the girdle of 38.5°;

the angle of inclination of the generatrix of the cone to the plane of the girdle 17°.

It is known that the refractive index of diamond for different wavelengths different:

- for the red color wavelength 687 μm, the refractive index 2,402;

- violet wavelength 397 μm, the refractive index - 2,465;

the other colors of the spectrum are in the middle of the specified range.

When hit by the light beam on the plane of a diamond is its decomposition into its constituent colors of the spectrum. The width of the decomposition of the color spectrum is determined by the angle between the refracted rays of red and purple.

The proposed method is as follows.

In Fig.1 shows a drawing of a diamond, where instead of the site of the diamond is the cone angle of the generatrix of the cone to the plane of the girdle, equal to 17 degrees. Almost all of the light rays with angles from the top of the stake is and perpendicular to the plane of the cone (partition) are refracted in accordance with N=sinα/sinβ, moreover, the width of the decomposition of the color spectrum is more than 1/2 degree. Light rays with angles from the perpendicular to the plane of the cone to the base of the cone does not affect the refracted rays. Possible variations change the angle of 17 degrees.

The implementation of the invention is produced in accordance with the technological process of manufacturing of diamonds.

Literature used:

1. Epifanov Century. And. processing Technology diamonds Moscow, Higher school, 1982

Method cut diamond, characterized in that the area of the diamond are in the form of a cone with the angle of the generatrix of the cone to the plane of the girdle, with the specified cut provide the following parameters:
diamond diameter D;
the total height H=0,61 D;
the size of the base of the cone d=0,52 D;
the thickness of the girdle r=0,04 D;
the height of the top of the girdle h1=0,22 D;
the height of the bottom to the girdle h2=0,39 D;
the angle of the sides of the top to the plane of the girdle 23,5°;
the angle of inclination of the faces of the bottom to the plane of the girdle of 38.5°;
the angle of inclination of the generatrix of the cone to the plane of the girdle 17°.



 

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