A large number of people I've met have never heard of spinel, let alone know how it looks like. It's a remarkable gemstone, and my colleagues in the jewellery industry often wonder why it's not more well-known or widely used. The reason for that seems to be that the occurence of spinel tend to be rare and come in small rough sizes, and by default can't be used all that much or in many designs. It's a little bit of a pity because they often come in such deep, complex colours - steely blues or dusky mauves that look like they are layered with a dozen other shades - that you almost never see in any other stone. Here are some spinel brilliant rounds that I was sorting out for the bespoke cocktail rings.