Spinel has an interesting history. For centuries, spinel was often mistaken for a ruby. For instance, it was only recently discovered that the famous Black Prince Ruby set into the Imperial State Crown of the United Kingdom is actually spinel. But now, spinel is very much appreciated among serious jewelry collectors and dealers. Not only for its color, which ranges from red, pink, purple and even bright blue, but also for its hardness and brilliance. Spinel is extremely rare. Ironically, even more rare than ruby. Like rubies, spinel is also found in Myanmar as well as Sri Lanka, Vietnam, Thailand and Madagaskar.