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Oval-cut diamond

a diamond and oval shape technology, applied in the field of oval cut diamonds, can solve the problems of difficult identification, poor brilliancy of reflection rays, and light coming with a large angle is not so effective for reflection rays, and achieve the effect of improving the brilliancy of reflection lights, brilliancy and good appearan

Inactive Publication Date: 2007-08-16
HOHOEMI BRAINS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention relates to a cut of diamond with an oval girdle that enhances the brilliancy of reflection lights. The technical effect of the invention is to provide a cut of diamond with an oval girdle that emits a greater amount of visual-perceptible reflection rays than a round brilliant cut diamond, which has a poor brilliancy of reflection rays. The invention also discusses the effect of the incident light angle on the reflection rays, and how the oval-cut diamond is modified to improve its brilliancy."

Problems solved by technology

On the other hand, light coming with a large angle is not so effective for reflection rays.
The oval-cut diamond that is not symmetrical with respect to a central axis has a poor brilliancy of reflection rays.
Since the diamond has different pavilion angles, different lower girdle facet angles and facets not directed in the central axis direction as explained above, lights reflected on the pavilion main facets and the lower girdle facets and light patterns appearing on these facets are not uniform, because reflection light directions from the facets are not the same, and they are difficult to identify because of extremely fine reflection patterns.
Also, the brilliancy on the crown facets and the table facet is very poor.

Method used

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Examples

Experimental program
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Effect test

example 1

[0081] An oval-cut diamond according to the present invention will be described with reference to the drawings showing EXAMPLE 1. FIG. 1 is a top plan view of the oval-cut diamond in EXAMPLE 1 of the present invention. FIG. 2 is a bottom plan view of the oval-cut diamond. FIG. 3 is a front view of the oval-cut diamond. FIG. 4 is a side view of the oval-cut diamond. In these figures, the oval-cut diamond 100 has a columnar girdle 110, a crown 120 placed above the girdle 110, and a pavilion 140 placed below the girdle 110. The crown 120 has an octagonal table facet 122 at its top. FIG. 1 is a diagram showing the crown 120 from above. FIG. 2 is a diagram showing the pavilion 140 from below.

[0082] An oval brilliant cut diamond has a girdle with an oval cross-section, a crown provided above the girdle and having a table facet at its top, and a pavilion located below the girdle. An upper ridge is located between the girdle and the crown. A lower ridge is located between the girdle and th...

example 2

[0105] With reference to FIGS. 7 to 10, description will be given of an oval-cut diamond 200 in EXAMPLE 2 of the present invention. FIG. 7 is a top plan view of the diamond 200. FIG. 8 is a bottom plan view of the diamond 200. FIG. 9 is a front view of the diamond 200. FIG. 10 is a side view of the diamond 200. In these drawings and the following description, the same components as those of the diamond 100 in EXAMPLE 1 are denoted by the same reference numerals. The diamond 200 has a columnar girdle 210, the crown 120 located above the girdle 210, and the pavilion 140 located below the girdle 210. The crown 120 and pavilion 140 of the diamond 200 have the same structures as those of the crown 120 and pavilion 140 of the diamond 100 in EXAMPLE 1.

[0106] A horizontal cross-section of the girdle 210 is shaped like a sixteen side polygon. The upper girdle facet 136 crosses an outer peripheral surface of the girdle 210 so as to form a straight line. The lower girdle facet 152 crosses the...

example 3

[0107] With reference to FIGS. 11 to 15, description will be given of an oval-cut diamond 300 in EXAMPLE 3 of the present invention. FIG. 11 is a bottom plan view of the diamond 300. FIG. 12 is a front view of the diamond 200. FIG. 13 is a side view of the diamond 200. FIG. 14 is a diagram illustrating optical paths in a zx-cross-section of the diamond 300. FIG. 15 is a diagram illustrating optical paths in a yz-cross-section of the diamond 300. The crown 120 of the diamond 300 is exactly the same as that in EXAMPLE 1. Accordingly, the top plan view of FIG. 1 also applies to the diamond 300. In these drawings and the following description, the same components as those of the diamond 100 in EXAMPLE 1 are denoted by the same reference numerals. The diamond 300 has a columnar girdle 310, the crown 120 located above the girdle 310, and a pavilion 340 located below the girdle 310.

[0108] The diamond 300 has pavilion main facets 342, 344 and 346 and lower girdle facets 352, 352a, 352b and...

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Abstract

An oval-cut diamond comprises a girdle having a contour line in an oval or oval-like shape, a crown above the girdle having an octagonal table facet on a top of it and a pavilion below the girdle. The girdle is of a ratio (b / a) of a short radius to a long radius of 0.6 or more, in which a radius in long axis direction is “a”, and a radius in short axis direction is “b”. A pair of pavilion main facets positioned opposite to each other with respect to a central axis has a pair of crown main facets or star facets facing the pair of pavilion main facets through the girdle. The two pavilion main facets, the two crown main facets or star facets and the table facet have a common vertical plane within the facets so that brilliancy of reflection lights coming out of the table facet and crown facets is enhanced.

Description

TECHNICAL FIELD [0001] The present invention relates to a cut of diamond, and in particular to a cut of diamond having an oval girdle that emits an enhanced brilliancy of reflection lights. BACKGROUND ART [0002] As a cut of diamond, a round brilliant cut is generally used. A round brilliant cut diamond has a table facet of a regular octagon on a top of a crown, and eight crown main facets, eight star facets and sixteen upper girdle facets on an outer circumference of the crown between the table facet and a girdle. The diamond further has a culet at an apex below the girdle, and eight pavilion main facets and sixteen lower girdle facets on an outer circumference of a pavilion between the culet and the girdle. So, the round brilliant cut is generally called a 58-facet solid, including the table facet and the culet. And, the round brilliant cut is eight times symmetrical with respect to a central axis. [0003] The present inventors introduced “amount of visual-perceptible reflection ray...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A44C17/00
CPCA44C17/001H04M1/0237
Inventor MATSUMURA, TAMOTSUKAWABUCHI, YOSHINORIITOH, AKIRA
Owner HOHOEMI BRAINS INC