Spinel is a gemologist's gem, not 'knowingly' well know to the public. I say 'knowingly' because red spinel, for instance, was thought to be ruby up until the end of the 1800s when the science caught up. There is a famous red spinel in the Crown jewels, called The Black Prince's ruby, that in fact is spinel. And spinel is still not well known or well appreciated but it is a hard, rare and beautiful gem. The blue spinel in this ring is all natural, untreated, 1.10 ct and set in platinum. Matching platinum bands sold separately at C$1450 per pair.