Method and implement for observing or photographing gem such as

Details Method and implement for observing or photographing gem such as Method and implement for observing or photographing gem such as

1991-06-27

1993-03-23

Ben, Loha

Optical: systems and elements

Miscellaneous

359385, 359798, 359804, 359900, 356 30, 356240, 362109, 362346, G02B 2700

Patent

active

051969661

ABSTRACT:
There are disclosed a method and an implement for permitting one to precisely know the degree of the brilliance of a diamond, the colors of the light, and so on. A gem to be observed or photographed is placed inside a container having an opening in the top. The gem is so placed in the container that light can enter the container only from directions lying within the range of angles of 20 to 50 degrees about the line vertical to the gem. The gem inside the container is observed or photographed from above the container while directing light into the container from above. As an example, the method is carried out with an implement comprising a container having an opening at the top, a reflecting plate having a hole in its center and disposed above the container such that the light reflected by this reflecting plate enters the container, and a seat portion on which a gem is placed. The seat portion is located substantially in the center of the bottom of the container. The straight line connecting the seat portion with one fringe of the opening forms an angle of 20 to 50 degrees with the straight line connecting the seat portion with the opposite fringe of the opening.

REFERENCES:
patent: 3410634 (1968-11-01), Buckner
patent: 3740142 (1973-06-01), Takubo
patent: 3867032 (1975-02-01), Bruck
patent: 3989379 (1976-11-01), Eickhorst
patent: 4152069 (1979-05-01), Bruck
patent: 4461568 (1984-07-01), Welbourn et al.
patent: 4906083 (1990-03-01), Sattler
patent: 5045688 (1991-09-01), Domenico et al.

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