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.
MAGNIFICATION: 20x Power magnification, LED and UV Lights, 21mm lens diameter The body is made of metal aluminum and a black frame. BLACK in color with a protective case, cleaning cloth and lanyard cord. A ready-to-go kit set designed for both hobbyists and professionals.
10x 21mm Loupe Jeweler Magnifier LED UV Light Triplet Lens Magnifying Gem Optical Tool Achromatic Aplanatic Foldaway Pocket Black Frame for Inspectin
10x Magnifier Jewelry Loupe LED UV Light 21mm Achromatic Triplet Lens Optical Glass Pocket Gem Magnifying Tool Jeweler, Stamp Philatelist, Coin Numismatic : : Office Products
3 Pieces 10X / 20X / 30X Jeweler Loupe Glass Diamond Loupe Metal Round Body Jewelers Eye Loupe Magnifier Magnifying 21mm Lens Diameter Silver Color : : Office Products
💎 Experience the incredible 10x magnification power of this pocket-sized jewelry loupe, revealing even the tiniest details 💎 Equipped with a 21mm
10x 21mm Loupe Jeweler Magnifier LED UV Triplet Lens Magnifying Gem Optical Tool Achromatic Aplanatic Foldaway Pocket Black Frame for Inspecting
10X Power Magnification Loupe with 2 Lightings UV and LED light, 21mm. Aplanatic and Achromatic glass for color and clarity. Black Frame to avoid
GEM-246 10x 21mm Loupe Jeweler Magnifier LED UV Light Triplet Lens Optical Tool
10X 20X 30X 40X 21mm Magnifying LED Triplet Loupe Dual Light White
PRECISION MAGNIFICATION: Offers a 10X Triplet lens for 1000% magnification through a 21 mm (2.1 cm) diameter glass lens for clear, distortion-free
MAXIMIZE Triplet Glass Lens Jeweler's Loupe | UV & White LED Light | 10X Magnification | 21 mm Diameter | Tear Drop Swivel Case | Leather Snap Pouch
This 10x magnification lighted loupe features a 21mm triplet lens and contains six bright white LED lights to illuminate the field of view & stones
GSTK-18 Jeweler Loupe Triplet Lens 10x Magnification Magnifier 21mm with LED UV Light Gemology Tool
10/20/30X Magnifier Jewelry Loupe LED UV Light 21mm Achromatic
10X Illuminated Jewelers Loupe Magnifier with Interchangeable Reticle Scale, LED Light, 25mm Field of View, for Jewelry,Gems, Coins, Hobby Tool (3 Glass Scale Chart) : : Office Products