Unisex Red Tigers Eye Coffin Rings .925 Sterling Silver Natural Colombianite This lovely piece opens by Essential Oil Diffusing Bracelet This lovely piece opens by rotating the Lotus Cone clockwise and revels a delicate Lotus flower exposing its center Mineral size varies 9 x 10mm ~ 15 x 10mm This phenomenon is called chatoyancy and occurs naturally in tiger's eye crystals due to the decomposing of a mineral compound called Crocidolite iron is exposed and oxidizes and turns into limonite which then gets embedded into quartz as it grows in place of the decomposed Crocidolite and changes color based on exposure to heat and other trace minerals