5.19 Cobalt Spinal

Cobalt spinel is a gemstone with an intense blue hue that has been prized by jewelers and collectors since the Middle Ages. It is one of the rarest gems in existence, rivaling even some diamonds in scarcity. Its rarity stems from its unique composition: cobalt spinel is composed of both titanium and iron, which give it its signature coloration while also making it incredibly hard to find naturally occurring specimens. As such, cobalt