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Show me: Any Piece Beads Bracelets Earrings Men's Rings Pendants Rings with Any stone No stones Agate Amethyst Ametrine Aquamarine Beryl Black Onyx Citrine Diamond Emerald Garnet Moonstone Morganite Opal Pearl Peridot Quartz Ruby Sapphire Spessartite Spinel Tahitian Black Pearl Tanzanite Topaz Tourmaline Zircon Search by piece #: Description: Opal is a silica gel containing 5%-30% water. Fire is caused by tiny silica spheres defracting light. The larger the spheres, the more intense the fire and variety of color. Australia has been the major producer of quality Opal since the 19th century. Hardness: 6 Origin: Australia, Mexico, Brazil Varieties: Black Opal (potch), Boulder Opal (iron stone), white based opal.