By definition, London Blue topaz is a topaz stone that has a very specific, inky shade of blue. It’s darker than regular topaz but lighter than a sapphire. In fact, the color is best described as a halfway point between the two.
While harder than quartz, London Blue topaz is not as hard as sapphires, rubies, or diamonds. The latter three are classified as gemstones, while topaz is classified as a mineral.
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