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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

Pocket Size Illuminated Magnifier Jewel Loupe with 20x

15x Magnifier Jewelry Loupe 20.5mm Triplet Lens Optical Glass Pocket Gem Magnifying Tool for Jeweler, Stamp Philatelist, Coin Numismatic, Achromatic Black Hexagonal Design Kit Set : Arts, Crafts & Sewing

This 20x magnification lighted loupe features 21mm Triplet Optical Glass Lens with 6 bright white LED lights to illuminate the field of view & stones being viewed. Its natural white light helps to look at inclusions, perfect light for viewing diamonds and other gemstones. It also has achromatic optical glass magnifier for better viewing result, metal body, UV light (long wave) for some stones that fluoresce under UV.

20X Jewelers Loupes Magnifier Pocket Jewelry Loupe Glass Folding Magnifying Illuminated Magnifying Tool with 21mm UV and LED Light for Eye Rocks

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