This 30x 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, a perfect light for grading diamonds and other gems LED lights & UV light are activated by separate miniature on/off switch, functions as either a LED loupe or as a UV loupe. Diamonds with flourescence will appear cloudy when viewed with the UV light on. 6 White LED Light Type Achromatic Loupe Magnification Power 30x Diameter of lens 21mm, optic glass Style Foldaway Two switch One for led, one for UV Powered by 3 x button batteries Precision optical glass lens brings fine micro-detail into view Made with the finest quality optics and with top quality metal cases Eliminates distortion at the outer edges of the magnifier