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London Blue Topaz

lon·​don blue to·​paz | ˈlən-dən blü tō-ˌpaz

noun

A popular variation of topaz with a vivid, dark blue-green color

London blue topaz is an aluminum silicate that contains up to 20% Fluorine or water. Traditionally, blue topaz was thought to have healing powers. It was valued for its perceived effect of tranquility.