Carnelian is a form of chalcedony that derives its red color from iron oxides. Some chalcedony is naturally red as it comes from the mine, but some is often impregnated with the ‘wrong sort’ of iron oxide resulting in a yellowish-gray. When heated, this type also turns red.
Most carnelian offered in the market is dyed chalcedony, but the fakes are often not too hard to spot under magnification and a strong light.
Brazil, Uruguay and India supply most of the carnelian, both genuine and fake.
Image courtesy of quirkyquartz.com.
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