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Fine Jewelry University Articles matching: “Crystal opal”

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Fine Jewelry University

  1. Three loose rubies in a row triangle oval and pear shaped

    Gem in the Spotlight: Ruby

    FJU Category: Gemstones | Tags: Folklore, Gem Spotlight, Gemology, Ruby

    … one of the hardest gems commonly used in jewelry second only to diamond (which has a Moh’s hardness of 10) and moissanite (which is in between). Rubies only occur in the color red which comes from trace amounts of chromium in the crystal structure. If they are too purple or too pink, they are called purple sapphires or pink sapphires, respectively. Since sapphires and rubies are the same gem material, they also share a refractive index of 1.762-1.770 and a specific …

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