Gems & Gemology, Summer 1982, Vol. 18, No. 2

Pinpoint Illumination: A Controllable System of Lighting for Gem Microscopy

Peer Reviewed Article
John I. Koivula
Pinpoint illumination uses a highly flexible but extremely durable glass fiber-optic bundle that incorporates six easily interchangeable light wands of various shapes and cross-sectional thicknesses down to one millimeter in diameter. The wands are hand held and can be used to illuminate hard-to-reach areas in complex jewelry mountings. With the pinpoint illuminator, a gemstone can be examined from any angle; the light source is placed exactly where it is needed, minimizing glare and unwanted external or internal reflections.

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