GemOro Jewelers Eye Loupe With LED Light 10X Loop GemOro's new generation of Eye Loupes features a high quality 10X, distortion free, bonded three piece lens made from optical glass, plus a built-in LED light source. The outer case is chrome plated, the inner case is matte black to insure color correctness. The LED light is powered by three powerful BA389 batteries. (included). In addition to the plastic carrying case, this item includes a small screwdriver for battery replacement. Size:2-5/8" long x 1-1/8" wide x 3/4" thick (folded). Lens diameter: 3/4" Magnification: 10X Why do I need this item? This is an essential item for viewing diamonds, gem stones or other small objects.