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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

[0029] The oval-cut diamond according to the present invention exhibits an enhanced brilliancy of reflection lights when observed above the table. The brilliancy has been improved by about 200 to 300% in comparison with that of a diamond flatly deformed in a breadth wise or a lengthwise direction from a round brilliant cut. Also, a girdle height can be substantially equal around the whole girdle circumference so that a good appearance can be obtained.

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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example 1

[0069] An oval-cut diamond according to the present invention will be described in detail with reference to the drawings showing EXAMPLE 1. FIG. 1 shows a top plan view of the oval-cut diamond of EXAMPLE 1 of the present invention, FIG. 2 shows a bottom plan view thereof, FIG. 3 shows a front view thereof, and FIG. 4 shows a side view thereof. In these drawings, the oval-cut diamond 100 comprises a columnar girdle 110, a crown 120 provided above the girdle 110, and a pavilion 140 provided below the girdle 110. The crown 120 has an octagonal table facet 122 on a top of the crown. FIG. 1 shows the crown 120 seen from the above, and FIG. 2 shows the pavilion 140 seen from the bottom.

[0070] An oval brilliant cut diamond comprises a girdle having an oval cross-section, a crown provided above the girdle and having a table facet on a top of the crown, and a pavilion provided below the girdle. The girdle has an upper ridge between the crown and the girdle and a lower ridge between the pavi...

example 2

[0096] An oval-cut diamond 200 according to EXAMPLE 2 of the present invention will be described with reference to FIGS. 7 to 10. FIG. 7 shows a top plan view of the diamond 200, FIG. 8 shows a bottom plan view thereof, FIG. 9 shows a front view thereof, and FIG. 10 shows a side view thereof. In these drawings and the following description, the same components as in the diamond 100 of EXAMPLE 1 are denoted by the same reference numerals. The diamond 200 comprises a columnar girdle 210, a crown 120 provided above the girdle 210, and a pavilion 140 provided below the girdle 210. The crown 120 and the pavilion 140 of the diamond 200 have the same structures as the crown 120 and the pavilion 140 of the diamond 100 of EXAMPLE 1.

[0097] A horizontal cross-section of the girdle 210 has sixteen sides. Each of upper girdle facets 136 crosses an outer peripheral surface of the girdle 210 with a straight line, and each of lower girdle facets 152 crosses the outer peripheral surface of the gird...

example 3

[0098] EXAMPLE 3 of an oval-cut diamond of the present invention will be descried in detail with reference to the drawings. FIG. 11 shows a top plan view of the oval-cut diamond of EXAMPLE 3 of the present invention, FIG. 12 shows a bottom plan view thereof, FIG. 13 shows a front view thereof, and FIG. 14 shows a side view thereof. In these drawings, the oval-cut diamond 300 comprises a columnar girdle 310, a crown 120 provided above the girdle 310, and a pavilion 340 provided below the girdle 310. The crown 120 has an octagonal table facet 122 on a top of the crown. FIG. 11 shows the crown 120 seen from the above and is substantially the same as FIG. 1, and FIG. 12 shows the pavilion 340 seen from the bottom. In these drawings and the following description, the same components as in EXAMPLE 1 are denoted by the same reference numerals.

[0099] In FIGS. 11, 13 and 14, the crown 120 is the same as that in EXAMPLE 1, and the description thereof will be omitted.

[0100] With reference to...

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PUM

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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. That is a modified oval brilliant cut diamond, in which one of the crown and the pavilion is rotated by about a sixteenth revolution around its central axis from an ordinary brilliant cut diamond. 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 the 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