Jeweler 10x Loupe, for Meteorites and Gems

This is a standard jeweler's loupe with a stated magnification of 10x. Optical quality is good, but I think 10x is optimistic. It produces a good

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GEMS Black 10x Hexagon Triplet Loupe

Jewelers Loupe 21mm Triplet 10X - Mama's Minerals

Education Archives - Service Jewelry & Repair

The Ultimate Guide to Colored Gemstones - Custom Jewelry Design

The light is used for checking fluorescence in diamonds. Diamonds with fluorescence will appear cloudy when viewed with the light on. Fluorescence is not 'diagnostic' but, as with most tests, it eliminates some possibilities, opens other possibilities, suggests which other tests to carry out, and that's how gemologists identify stones.

21mm Jeweler Loupe 10x Magnifier with LED and UV Light

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Loupes for Diamond & Jewelry – GemTrue

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Triplet Loupes - Spirit Rock Shop