Spinel is one of the most underappreciated gems in the history. Not recognised until the 19th century as a separate gem species, it was commonly mistaken for ruby and sapphire. Many famous Royal gems turned out to be spinels, when finally tested. In this ironic way, great spinel gemstones helped ruby and sapphire in becoming popular. Spinel gemstone is found in many localities: Burma, Viet Nam, Sri Lanka, Tanzania and others. Spinels are mined in most colours but pure yellow and green is rather unheard of. Recently Spinel started becoming more known in its own right, after new varieties were discovered. The glowing, hot pink of Mahenge stones or vivid Cobalt blue of Luc Yen Spinels, certainly makes an impression.