Diamond gem-cutting structure providing multiplicity of visually perceived diffracted beams for decorative usage and method for evaluating the same

FIELD: decorative diamond gem-cutting structure and method for evaluating of diamond.

SUBSTANCE: gem-cutting structure is made in the form of round diamond gem-cut comprising rundist, crown above rundist and pavilion under rundist. Height of rundist is 0.026-0.3 the radius of rundist, angle of pavilion of rundist main facet is ranging between 37.5 deg and 41 deg, and angle of main facet of crown is within the range conforming to the following ratios: c>2.8667xp+134.233 and p<1/4x{sin-1(1/n)+sin-1 (1/n˙sinc))x180/π +180-2c}, where n is diamond diffraction ratio; π is circle constant; p is angle of pavilion, deg; c is angle of crown, deg. Decorative diamond cutting design presents multiplicity of visually perceptible diffracted beams, when observer contemplates diamond on the side of pavilion facet at sight angle less than 20 deg relative to vertical line extending through center of facet of platform.

EFFECT: increased number of perceived diffracted beams to impart additional aesthetic attractiveness to diamond.

13 cl, 43 dwg

 

The text descriptions are given in facsimile form.

1. Design round brilliant cut decorative diamond, providing many visually perceive the reflected beams containing

essentially round or polygonal girdle having an upper horizontal section and a lower horizontal section parallel to the upper horizontal section,

the crown on the upper horizontal section of the girdle, with the facet of the site and at least one main facet of the crown, and

the pavilion below the lower horizontal section of the girdle having at least one main facet of the pavilion,

the height (h) of the girdle between the upper and lower horizontal sections of the girdle is 0,026 0,radius the girdle, the angle (p) of the pavilion between the main pavilion facet and the lower horizontal section of the girdle is in the range from 37.5 to 41° and angle (C) of the crown between the main facet of the crown and the upper horizontal section of the girdle is in the range satisfying the relations

c>-2,8667×p+134,233 and

p<1/4×{(sin-1(1/n)+sin-1(1/n·sinc))×180/π+180-2c},

where n is the refractive index of diamond,

π - constant circumference,

p - pavilion angle in degrees

with the angle of the crown in degrees.

2. Design cut diamond, providing many visually perceive the reflected rays according to claim 1, in which the height (h) of the girdle is from 0.030 to 0.15 radius of the girdle.

3. Design cut diamond, providing many visually perceive the reflected rays according to claim 1, in which the diameter of the pad is from 0.45 to 0.60 of the girdle diameter.

4. Design cut diamond, providing many visually perceive the reflected rays according to claim 2, in which the diameter of the pad is from 0.45 to 0.60 of the girdle diameter.

5. Design cut decorative diamond, providing many visually perceive the reflected beams containing

essentially round or polygonal girdle having an upper horizontal section, limited to the military upper perimeter, and the lower horizontal section parallel to the upper horizontal section and a restricted lower perimeter,

the crown shape is close to a truncated polygonal pyramid, located on the upper horizontal section of the girdle, with the facet of the site in the form of regular octagon in the upper part of the truncated polygonal pyramid, eight major facet crowns, eight facet stars and sixteen upper girdle facet, and

the pavilion, a shape close to a polygonal pyramid, located under the lower horizontal section of the girdle, which has eight main pavilion facet and sixteen lower girdle facet,

moreover, the Central axis passes from the Central vertex of a polygonal pyramid pavilion through the center facet of the site, the first plane, each of which runs from the Central axis through the corresponding of the eight vertices of a facet of the platform, and the second plane, each of which runs from the Central axis and divides the angle between two adjacent first planes into two equal angle, with

each of the main facets of the crown is a rectangular flat surface having two opposite vertices, one of which is one of the vertices of the facet areas, and the other is the intersection point of the upper perimeter of the girdle with what erway plane, passing through the top facet fields,

rectangular flat surface has the other two opposite vertices located on the respective adjacent second planes, and each of these vertices coincides with a vertex of the corresponding adjacent main facet of the crown,

every facet of the star is a triangle, the base of which coincides with a side facet of the platform and the top of which coincides with the common vertex of two adjacent main crown facets, each of which has a direction passing through the two ends of the base,

each upper girdle facet is a triangle having a side coinciding with one of the sides of the main facets of the crown and cross the top perimeter of the girdle at the end of the side and the top, in which the second plane passing through the other end side, crosses the upper perimeter of the girdle,

each main facet of the pavilion is a rectangular flat surface having two opposite vertices, one of which is the intersection of the second plane with the bottom perimeter of the girdle, and the other coincides with the Central vertex of the polygonal pyramid pavilion,

rectangular flat surface has the other two opposite vertices, RA is relying on the adjacent first planes, each main facet of the pavilion has a side coinciding with a side of the adjacent main pavilion facet, and two vertices, each of which coincides with the vertex of the corresponding adjacent main pavilion facet, and

each lower girdle facet is a triangle having a side coinciding with a side of one of the main facets of the pavilion and across the bottom perimeter of the girdle at the end of the side and the top, in which a first plane passing through the other end side, crosses the lower perimeter of the girdle,

in which the height (h) of the girdle between the upper and lower horizontal sections of the girdle is 0,026 to 0.3 of the radius of the girdle, the angle (p) of the pavilion between the main pavilion facet and the lower horizontal section of the girdle is in the range from 37.5 to 41° and angle (C) of the crown between the main facet of the crown and the upper horizontal section of the girdle is in the range satisfying the relations

with>-2,8667×p+134,233 and

p<1/4×{(sin-1(1/n)+sin-1(1/n·sinc))×180/π+180-2c},

where n is the refractive index of diamond,

π - constant circumference,

p - pavilion angle in degrees

with the angle of the crown in degrees.

6. Design cut diamond, providing plenty of visually perceived tragen the x-rays, according to claim 5, in which the height (h) of the girdle is from 0.030 to 0.15 radius of the girdle.

7. Design cut diamond, providing many visually perceive the reflected rays according to claim 5, in which the diameter of the pad is from 0.45 to 0.60 of the girdle diameter.

8. Design cut diamond, providing many visually perceive the reflected rays according to claim 6, in which the diameter of the pad is from 0.45 to 0.60 of the girdle diameter.

9. Method of monitoring a decorative diamond-containing segments, which provide a decorative diamond with round diamond cut, which contains essentially round or polygonal girdle having an upper horizontal section and a lower horizontal section parallel to the upper horizontal section, a crown on the upper horizontal section of the girdle, with the facet of the site and at least one main facet of the crown and the pavilion below the lower horizontal section of the girdle having at least one main pavilion facet, in which the height (h) of the girdle between the upper and lower horizontal sections of the girdle is 0,026 to 0.3 of the radius of the girdle, the angle (p) of the pavilion between the main pavilion facet and the lower horizontal section of the girdle is in the range from 37.5 to 41° and angle (C) of the crown between the main facet of the crown and the top of them horizontal section of the girdle is within, satisfying the relations

with>-2,8667×p+134,233 and

p<1/4×{(sin-1(1/n)+sin-1(1/n·sinc)×180/π+180-2C},

where n is the refractive index of diamond,

π - constant circumference,

p - pavilion angle in degrees

with the angle of the crown in degrees

and carry out supervision of the facet areas of the diamond, the light rays entering into the diamond through the facet of the courts and the crown facets, namely: the main crown facets, the facets of the stars and the girdle facets crowns, and coming out of the facet areas and facets of the crown, at a visual angle of less than 20° relative to the vertical line passing through the center of the facet fields.

10. Observation method according to claim 9, in which the light rays enter the diamond at an angle in the range from 10 to 50° relative to the vertical line passing through the center of the facet fields.

11. The method of monitoring of claim 10, in which the light rays enter the diamond at an angle in the range from 20 to 45° relative to the vertical line passing through the center of the facet fields.

12. Observation method according to claim 9, in which the height (h) of the girdle is from 0.030 to 0.15 radius of the girdle.

13. Observation method according to claim 9, in which the diameter of the pad is from 0.45 to 0.60 of the girdle diameter.



 

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