The birthstone of May, emerald is classified as the green variety of the mineral beryl (BE3AL2Sio6). Its beautiful green color is created by a combination of trace elements vanadium, chromium, and iron. Varying levels of each dictate the intensity of green color and the warm florescence that the finest emeralds are know for. At a 7.5-8 on the Mohs hardness scale, emeralds are an excellent choice for use in jewelry. Emeralds high demand and rarity has made a way for it to be traditionally acceptable to be treated with oil. Our stones are never treated with oil as we feel that it masks the natural beauty and the true value of each stone.