|Spinel is a hard vitreous magnesium aluminum oxide that has been used as a gemstone for centuries. Spinel has been mistaken for ruby and sapphire in the past. Spinel occurs in a range of colors.|
|Spinel can be distinguished from other gemstones by its octahedral crystal structure and single refraction. Spinel has a lower Mohs hardness than ruby and sapphire. Spinel occurs with ruby and sapphire, and significant deposits have been found in Cambodia, Myanmar (Burma), Sri Lanka (Ceylon) and Thailand.|
The rarest and most desirable spinel gemstones are vivid ruby-like red, followed by cobalt blue, bright pink and bright orange. Prices for 'class A' color-change spinel offer excellent value. According to some experts, current prices for color-change spinel are an insult to their beauty and extreme rarity.