Abstract: The present invention relates to an instrument for observing the brilliance of jewels, especially of diamonds, and a method of photographing them with this instrument. The instrument of this invention is composed of a lower tubular portion comprising a non-transparent material and an upper tubular portion comprising a semi-transparent material, and a magnifying observation lens can be furnished on the upper end part of said upper tubular portion in accordance with using purposes of the instrument. The semi-transparent upper tubular portion can move slidably with respect to the lower tubular portion. The diamond is positioned on a placing part within the lower tubular portion, and an observer studies it from the upper end part of the upper tubular portion. According to this instrument, the semi-transparent upper tubular portion adjusts appropriately the light directing to the diamond, and as a result, it is possible to observe characteristic patterns corresponding to the diamond brilliance.

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.