Device for judging brilliancy of precious stones such as diamond

Details Device for judging brilliancy of precious stones such as diamond Device for judging brilliancy of precious stones such as diamond

1984-06-28

1987-03-03

Evans, F. L.

Optics: measuring and testing

Crystal or gem examination

G01N 2187

Patent

active

046471944

ABSTRACT:
A device for judging precious stones such as diamonds with ease, especially enables judgment of quality of cut, clarity or existence of imperfections and color grade of diamonds without requiring expert skill or experience. The device body (1) is provided with a window (3) at its upper part and light source (2) at its lower part. A plate (4) for supporting precious stones such as diamonds, is slidably inserted and carried between the window (3) and the light source (2). A base plate (14) which is slidably secured, is also provided to the device body (1), and a magnifying glass (12) for presenting precious stones in enlargement through the window (3), is fixed to the base plate (14). On the object lens side of the magnifying glass (12) is mounted a disc (17) having a small hole (18). The exterior of the disc (17) is colored in red or silver.

REFERENCES:
patent: 1744485 (1930-01-01), Michel et al.
patent: 2494078 (1950-01-01), Woodruff
patent: 2742813 (1956-04-01), Zeininger

Affiliated with

Also associated with

Rating

Device for judging brilliancy of precious stones such as diamond does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Device for judging brilliancy of precious stones such as diamond, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for judging brilliancy of precious stones such as diamond will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1014244