10 x 21mm Mini Folding Illuminated Loupe Jewelry Magnifier Pocket with LED Light, for Gems Jewelry Jewelers Eye Rocks Stamps Coins Watches Hobbies

10X MAGNIFICATION , 2-IN-1 with 6 LED Light and 21mm triplet lens to enable achromatically and alphabetically corrected. White LED light helps to look

GM-1018 10X Jeweler Loupe Magnifier + LED light, 18mm lens – Gain

30x Magnifier Loupe Foldable Pocket Illuminated

Formline LED Illuminated Jewelers Loupe/Scope (60x +

Rongon Jewelers Loupe Magnifier with Lights 30X

10x Foldable Pocket Magnifier Loupe with UV and LED Light for Jewelry, Rocks, Coins, and Antiques - Illuminated Magnifying Tool for Eye, Stamps, Watches, Hobbies, and Gems : Arts, Crafts

10 x 21mm Mini Folding Illuminated Loupe Jewelry Magnifier Pocket with LED Light, for Gems Jewelry Jewelers Eye Rocks Stamps Coins Watches Hobbies Antiques Gems

Pocket Jewelry Loupe 30x 21mm Jewelers Eye Magnifying Glass

10X Illuminated Jewelers Loupe Magnifier with

10x Foldable Pocket Magnifier Loupe with UV and LED Light for Jewelry, Rocks, Coins, and Antiques - Illuminated Magnifying Tool for Eye, Stamps, Watches, Hobbies, and Gems : Arts, Crafts

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