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Learn about Gemstones Zircon Color: red, orange, purple, green, blue, yellow, brown Hardness: 6 - 7.5 Refractive Index: 1.78 – 2.01 Density: 3.95 – 4.80 Chemical Composition: ZnSiO4 Crystal Structure: trigonal Origins: Tanzania, Kenya, Madagascar, Cambodia, Sri Lanka, Burma, Thailand, Vietnam, Australia. Back

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