precious gemstones : Amethyst, Andalusite, Aquamarine, Beryl, Black Opal, chrysoberyl Cats-eye, chrysoberyl Alexandrite, Chrysoprase, Corundum, Demantoids, Diamonds, Emeralds, Garnets, Jadeite, Lapis Lazuli, Nephrite, Opal, Peridot, Ruby, Sapphire, Tanzanite, precious Topaz, Tourmaline, Turquoise, Zircon, Zoisite.