JPH075830A - Method for sticking optical photograph of reflected image of heart mark to written statement of expert opinion for diamond - Google Patents

Abstract

PURPOSE:To contribute to consumer protection and improvement in reliability of jewellery industry by making it possible to visually explain to a consumer the state of cutting (symmetry) on a pavilion side by the shape of the reflected image (heart mark) by the optical photograph from the pavilion side. CONSTITUTION:There is meaning in that this optical photograph is stuck for the first time to a written statement of an expert opinion for diamond (quality analysis report) as a result of acquiring of research data to check the superiority and inferiority of the state of cutting (symmetry) on the pavilion side of the diamond and more particularly the superiority and inferiority of the regularity of light returning to the table plane of the crown side by development of a technique to photograph the reflected image (heart mark) on the pavilion side and by the shape and state of this heart mark.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in the process of quality analysis of diamond, is based on the shape of the heart-mark reflection image obtained by this optical photography, and the cut state (symmetry) of the round brilliant cut (58-sided face) on the pavilion side. It is very effective in judging superiority or inferiority, and by attaching a photograph to a diamond certificate (quality analysis report), it is possible to more accurately prove the superiority or inferiority of the cut state (symmetry) to the consumer.

[0002]

2. Description of the Related Art Only an optical photograph taken from the front side of the crown side of a diamond is attached to a conventional certificate (quality analysis report), and a diamond certificate (quality analysis from the pavilion side) is attached. There was no report format. Moreover, the photography technique was not developed.

[0003]

The optical photograph attached to the conventional diamond appraisal report (quality analysis report) was able to judge the superiority or inferiority of the cut of the crown portion, but there was no optical photograph on the pavilion side. The superiority or inferiority of the symmetry (symmetry) on the pavilion side can be visually determined by the shape and presence of the reflection image (heart mark) obtained by this imaging technique.

[0004]

[Means for Solving the Problems] A round black light shielding plate of about 3 cm is laid on a box surrounded by frosted glass containing a fluorescent lamp, and a diamond to be inspected is placed on the table and the shielding plate is placed. A camera with a white donut-shaped daylighting plate attached to a close-up lens, placed horizontally on top of the table, and focused on the shield plate from directly above the curette on the diamond pavilion side with the table underneath. A reflection image of the heart mark appears on the table surface. The reflection image of this heart mark does not appear regularly on all diamonds, and depending on the cut state (symmetry) on the pavilion side, the shape of the heart reflection image may be distorted, large or small, or the shape may not appear. is there. In other words, the light rays incident on the facets (main facets) on the pavilion side are internally reflected and regularly appear as inverted heart mark reflection images of the two main facets on the table surface in contact with the black shading plate. , The light rays incident from the crown side are regularly internally reflected on the pavilion side and returned to the crown side again as "brilliance" (glow) and "dispersion" (dispersion), which is most important for the beauty of the diamond. It becomes one of the factors to judge the state of the cut.

[0005]

[Function] By attaching a photograph of the reflection image (heart mark) on the pavilion side to the bottom of the optical photograph taken from the crown surface pasted on the conventional diamond appraisal report (quality analysis report), the pavilion side The superiority or inferiority of the cut state (symmetry) can be visually explained to the consumer.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A photo-taking method will be described with reference to FIG. 1 is Micro Nikkor 55m / m
With the close-up lens of the reverse use, cover the hood with a donut type white reflector with a hole at the center of the lens surface 2. Numeral 3 is a ground glass light box containing a fluorescent tube. The black shading plate 4 is placed on top of the 3 and the diamond 5 is placed on the top of the table 4 with the table face down, and the picture is taken.

[0007]

[Effect of the Invention] By adding the cut evaluation (proportion & finish) that affects the most important shine of the diamond to the crown side, and attaching the optical photograph from the pavilion side to the diamond certificate (quality analysis report) It is also beneficial from the perspective of consumer protection to be able to visually prove superiority to consumers who purchase diamonds. Judgment based on the superiority of the shape of the reflection image (heart mark) on the pavilion side is the most important shine in the beauty of the diamond, that is, the light incident from the crown side is regularly reflected on the facet surface on the pavilion side and is reflected on the table surface. It is also significant because it can be proved optically and visually that it has returned to the eyes as intense white light.

[Brief description of drawings]

FIG. 1 is a front view 1 of superiority and inferiority due to the shape of a heart mark reflection image when a diamond is photographed by the photographing method of the present invention, which demonstrates the excellent symmetry on the pavilion side where the heart mark reflection image is uniform. In No. 2, the reflection image of the heart mark is irregular and missing, and the symmetry is poor. 3 is the same as 2.

FIG. 2 is a side view of a shooting method.

[Explanation of symbols]

 1. Close-up lens 2. White daylight hood 3. Ground glass light source box with fluorescent tube 4. Black light shield 5. Inspection object (diamond)

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[Procedure amendment]

[Submission date] April 14, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

FIG. 1 shows a photograph image diagram equivalent to a heart mark reflection image when a diamond pavilion is photographed by a photographing method of the present invention. No. 1 proved the symmetry on the pavilion side that the reflection image of the heart mark was uniform and excellent. In No. 2, the reflection image of the heart mark is irregular and missing, and the symmetry is poor. 3 is the same as 2.

Claims (2)

[Claims] 1. A shape of a reflection image (heart mark) appearing on the pavilion side of a round brilliant cut (58-sided) diamond photographed by a special photographing technique can determine the superiority or inferiority of the state of cut (symmetry),
A patent for the format to attach this heart mark optical photograph to a diamond certificate (quality analysis report). 2. A patent for a technique for taking an optical photograph for the above purpose.