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Fine Jewelry University

1. 

   Gem in the Spotlight: Opal

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

   … commonly used in jewelry. For reference, here are the Mohs hardness values for some other gemstones you may know: Diamond 10, Sapphire 9, Amethyst 7, and Peridot 6. Turquoise is about as hard as opal, but you would need to consider Pearl or… shall see the living fire of the ruby, the glorious purple of the amethyst, the sea green of the emerald, all glittering together in an incredible mixture of light.” During the Middle Ages, opal gained an interesting reputation for …