Some of the most famous Rubies in the world are actually
Spinels, including the ‘Black Prince’s Ruby’ in the Crown Jewels. Spinel was confused for Ruby until the 18th Century, when it was proved to be a different gem. Along with red, Spinel can be found in pink, purple, blue, orange and black. It is the most recent addition to the Birthstone list, having been added in July 2016.