Spinel was confused with Sapphires and Rubies for over 1000 years, and has even been used in crown jewels from many different countries! Spinel is typically found formed into octehedrons, while Corundum (the mineral that forms Sapphires and Rubies) is formed into hexagonal prisms. Spinel in beautiful gemstone quality is much rarer than a Corundum gem, but is not as popular, rendering it much more affordable! http://geology.com/minerals/spinel.shtmlSpinel: Red and blue gemstones confused with ruby or sapphire
Spinel is a gemstone that occurs in a wide range of colors. Red and blue spinels have often been confused with ruby and sapphire.
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