Zircon

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Not Cubic Zirconia, natural zircon is highly refractive with strong dispersion, which is a fancy way of saying it is brilliant and sparkly and full of fire! You tend to get it in either clear, a sort of warm brownish colour and blue. Beloved by Victorians, it has rather fallen out of favour to the extent that lots of people haven't even heard of it, and assume it's the same of cubic zirconia (which is synthetic). It's not, and it is beautiful in its own right.