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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 Amber (both 2.5) to find a commonly used gem that is softer than opal. Common Opal Treatments There are several different treatments that can be applied to opals to alter their appearance. By far the most common is “sugar” or “smoke…