Device for judging the quality of precious stones.

摘要

A device for judging the quality of precious stones such as diamonds with ease. The device especially enables judgement of quality of cut, clarity or existence of imperfec- tions and colour grade of diamonds without requiring expert skill or experience. The device has a body (1) 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 mounted on the body (1) between the window (3) and the light source (2). A base plate (14) is slidably mounted on the body (1) and a magnifying glass (12) for viewing precious stones 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 coloured in red or silver or other colour.