JPH06213818A - Method for observing or photographing diamond - Google Patents

Abstract

PURPOSE:To provide a method for observing or photographing a diamond, which can acquire the brightness state of the diamond clearly based on the good or bad state of a cut and can simply judge the good or bad state of the cut of the diamond simply even by a novice. CONSTITUTION:A light source 2 is arranged in an approximately symmetry pattern with the axial extension line of a diamond 1 as the center or so as to surround the axial extension line at a position, which is separated by an suitable interval from the diamond 1. The position is located in the range of 21 deg.-39 deg., preferably 24 deg.-36 deg., with the diamond 1 to be observed or photographed as the center. The diamond 1 is observed or photographed (a) from the opposite direction with respect to the diamond 1 with the light source 2 in-between.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for observing or photographing the brilliance of diamonds.

2. Description of the Related Art An ideal brilliant-cut diamond exhibits a large brilliance because most of the light incident on the diamond is regularly internally reflected by the cut surface and returned to the crown side. On the other hand, a rough diamond with a cut that only finds the size of the stone does not have the cut surfaces facing in the correct direction, so the light incident on the diamond cannot be regularly reflected internally, and the light collected on the crown side The amount of is also small, so the shine is small.

[0002]

Conventionally, the photographs used for the certificate of diamond, etc. are obtained by illuminating the diamond from below and photographing it from above with a camera.
In this way, the diamond projected is black in the areas where it looks brightest and barely visible when viewed with the naked eye, and white in other areas. Therefore, in this photograph, it is impossible to determine which part is truly bright. In addition, although the white part should have brilliance intensity originally, this photograph shows almost no difference in brilliance, and the brilliance intensity cannot be discriminated at all. The present invention has been made in view of such a conventional problem, it is possible to clearly grasp the state of the brilliance of the diamond based on the quality of the cut, by which even an amateur can easily determine the quality of the diamond cut. The purpose is to provide a method of observation or photography that can be performed.

[0003]

According to the method of the present invention for achieving the above object, the diamond to be observed or photographed is centered at 21 to 39 °, preferably 24 to 36 °.
Within a range of and at an appropriate distance from the diamond, a light source is arranged so as to be approximately symmetrical with respect to the axial extension line of the diamond or surround the axial extension line, and the direction opposite to the diamond with the light source interposed A method for observing or photographing a diamond, which comprises observing or photographing a diamond.

When the light source is arranged so as to surround the axis extension line, the light source may surround the diamond axis extension line continuously (for example, in a ring shape), or may be spaced around the axis extension line. It may be placed in place. Also,
As the light source, in addition to an electric light-emitting body such as a light bulb, a member coated with a light-emitting paint, a reflector such as a mirror, a member of white color, or the like can be arranged. Further, in the method of the present invention, it is advantageous to make the surroundings as dark as possible in order to capture a clear diamond pattern. However, even if the surroundings are bright to some extent, it can be carried out if the light source is relatively bright. .

[0005]

1 is a block diagram of the present invention, in which 1 is a diamond to be observed or photographed, and 2 is a light source. In this configuration diagram, a ring-shaped light source (for example, a ring-shaped light bulb) that surrounds the axial extension line X of the diamond is arranged as the light source 2. Light is incident on the diamond 1 from the light source 2, but the angular range α in which the light is incident is limited to 21 to 39 °. If the angle α is out of the range of 21 to 39 °, it becomes difficult to see the pattern corresponding to the brilliance of the diamond,
The part that normally looks bright with the naked eye appears dark. Particularly, when the angle α is about 24 to 36 ° (more preferably about 28 to 32 °), the sharpest pattern can be grasped.

The photographs shown in FIGS. 2 to 15 are photographs of an ideal brilliant-cut diamond taken from the crown side at various angles α by the method shown in FIG. 1. Angle α is as follows. Figure 2: 50 ° Figure 9: 28 ° Figure 3: 46 ° Figure 10: 26 ° Figure 4: 42 ° Figure 11: 24 ° Figure 5: 39 ° Figure 12: 23 ° Figure 6: 36 ° Figure 13: 22 ° Fig. 7: 33 ° Fig. 14: 21 ° Fig. 8: 30 ° Fig. 15: 20 °

According to this, in the photographs of FIGS. 7 to 9 in which the angle α is about 30 °, the brightest part is clearly captured by the eight white arrows, and the brightness is different. Some parts can be grasped by the shade of the pattern, and it can be clearly recognized that this diamond is an ideal brilliant cut. On the other hand, as the angle α becomes smaller (in the order of FIG. 10 → FIG. 15), the captured diamond pattern becomes gradually darker and the definition becomes worse. Then, when the angle α is less than 24 °, some of the eight white arrows start to be chipped, and when it is less than 21 °, it becomes remarkable. On the other hand, as the angle α increases (from FIG. 6 to FIG. 2),
Although the brightness of the entire pattern is increased, a part of the eight white arrows begins to be lost, and the degree becomes remarkable when the angle α exceeds 39 °. Then, when the angle α becomes 45 ° or more, FIG.
The parts of the eight white arrows captured in the photograph of FIG. 9 are almost black, and the other parts are white, on the contrary.
As in the case of the conventional method, the most brightly visible part of the image is black. For the above reason, the angular range α in which the light is incident on the diamond 1 from the light source 2 is 2
It is limited to 1 to 39 ° (preferably 24 to 36 °).

Further, in the method of the present invention, it is necessary to arrange the light source 2 substantially symmetrically with respect to the axial extension line X of the diamond 1 or to surround the axial extension line X. This is because if the light emitted from the light source 2 and impinging on the diamond 1 is unbalanced in the circumferential direction of the diamond, the uniform light does not enter the entire diamond, so the amount of internally reflected light becomes non-uniform in the circumferential direction of the diamond. This is because the clear pattern cannot be captured. In this sense, the light source is arranged so as to surround the axis extension line X, for example, a ring-shaped light bulb is arranged around the axis extension line X, or a plurality of light bulbs are arranged at appropriate intervals. Most preferably, they are arranged in a shape.

[0009]

16 and 17 show an embodiment of the present invention, in which 1 is a diamond to be observed or photographed, 2a
Is a light source, and in the present embodiment, the light source 2a is composed of a ring-shaped light bulb surrounding the diamond axial extension line X as a center. The light source 2 for diamond 1
Light enters in the angle range α of 21 to 39 °, preferably 24 to 36 ° from a. A ring-shaped shield member 3 is provided behind the light source 2a in order to shield the light from the light source 2a from the observation side.

When a light source that continuously surrounds the diamond axis extension line X is provided as in this embodiment, the light source does not necessarily have a ring shape. For example, (a) and (b) in FIG. ), A suitable planar shape such as a triangular shape or a quadrangular shape can be used. Further, a plurality of ring-shaped light bulbs may be concentrically provided.

FIGS. 19 and 20 show another embodiment of the present invention, in which the light source 2b is composed of a plurality of light bulbs which are arranged at intervals so as to surround the diamond axial extension line X as a center. It was done. When the light source 2b is composed of a plurality of light bulbs arranged at intervals as in this embodiment, for example, an appropriate arrangement as shown in the plan views of (a) to (c) of FIG. can do.

Further, the light source may be composed of an electric light-emitting body such as a light bulb, a member coated with a light-emitting paint, a reflecting plate such as a mirror, a white-colored member, or the like. FIG. 22 shows an embodiment thereof, in which the light source 2c is composed of a ring-shaped reflector. In this embodiment, the light 4 is provided below the reflection plate, and the light of the light 4 is applied to the reflection plate,
The diamond is irradiated with light. The central hole of the reflector is preferably small to some extent in order to secure the amount of light condensed on the diamond by the reflector.
It should be noted that even if a plate coated with a luminescent coating, a plate of a white color, or the like is provided instead of the reflection plate serving as the light source 2c, it functions as a light source.

[0013]

According to the observing or photographing method of the present invention described above, it is possible to clearly observe or photograph the shining state based on the quality of diamond cutting without using a special instrument, and to cut the diamond. Even an amateur can easily judge pass / fail.

[Brief description of drawings]

FIG. 1 is a block diagram of the method of the present invention.

FIG. 2 is a photograph of a diamond taken with an angle α of 50 ° by the method shown in FIG.

FIG. 3 is a photograph of a diamond taken with an angle α of 46 ° by the method shown in FIG.

FIG. 4 is a photograph of a diamond taken at an angle α of 42 ° by the method shown in FIG.

5 is a photograph of a diamond taken with the angle α set to 39 ° by the method shown in FIG.

FIG. 6 is a photograph of a diamond taken with an angle α of 36 ° by the method shown in FIG.

FIG. 7 is a photograph of a diamond photographed by the method shown in FIG. 1 with an angle α of 33 °.

FIG. 8 is a photograph of a diamond taken by the method shown in FIG. 1 with an angle α of 30 °.

FIG. 9 is a photograph of a diamond taken with an angle α of 28 ° by the method shown in FIG.

10 is a photograph of a diamond taken by the method shown in FIG. 1 with an angle α of 26 °.

FIG. 11 is a photograph of a diamond taken at an angle α of 24 ° by the method shown in FIG.

FIG. 12 is a photograph of a diamond taken at an angle α of 23 ° by the method shown in FIG.

FIG. 13 is a photograph of a diamond taken at an angle α of 22 ° by the method shown in FIG.

FIG. 14 is a photograph of a diamond taken at an angle α of 21 ° by the method shown in FIG.

FIG. 15 is a photograph of a diamond photographed at an angle α of 20 ° by the method shown in FIG.

FIG. 16 is a vertical sectional view showing an embodiment of the present invention.

FIG. 17 is an arrow view taken along the line AA of FIG.

FIG. 18 is a plan view showing an arrangement example of light sources.

FIG. 19 is a vertical sectional view showing another embodiment of the present invention.

20 is an arrow view taken along the line AA of FIG.

FIG. 21 is a plan view showing an arrangement example of light sources.

FIG. 22 is a longitudinal sectional view showing another embodiment of the present invention.

[Explanation of symbols]

1 ... Diamond, 2, 2a, 2b, 2c ... Light source, 3 ...
Shielding member, 4 ... Light, X ... Axis extension line

Claims (2)

[Claims] 1. An approximately symmetrical or axial extension line with respect to the axial extension line of the diamond at a position within a range of 21 to 39 ° around the diamond to be observed or photographed and at an appropriate distance from the diamond. A method for observing or photographing a diamond, comprising arranging a light source so as to surround the light source, and observing or photographing the diamond from a direction opposite to the diamond while sandwiching the light source. 2. An approximately symmetrical or axial extension line about the axial extension line of the diamond is provided at a position in the range of 24 to 36 ° around the diamond to be observed or photographed and at an appropriate distance from the diamond. A method for observing or photographing a diamond, comprising arranging a light source so as to surround the light source, and observing or photographing the diamond from a direction opposite to the diamond while sandwiching the light source.