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Uses of Corundum

Corundum has a litany of industrial uses from abrasives, to screens, to parts in satellites. It also has commercial purposes in jewelry, though what role corundum is used for depends on its quality.

Highly included corundum is typically used as an abrasive in products like sandpaper, nail files, belt sanders, etc. Since other materials with similar hardness can be cheaply synthesized, corundum is not always used.

R12012 | right | medium | “Stone ID: R12012”For high-end machinery, like telescopes, space-shuttle windows, and more, synthetic corundum is a very popular choice. The key factor here is that the corundum is synthetic, or a man-made variety. It is very difficult and rare to find high-clarity natural corundum, much less being perfectly clear and good enough for laboratory purposes.

Primary Use of Natural Corundum

The most widespread use of natural corundum is in jewelry as rubies and sapphires. Red corundum is a ruby, though corundum of any other color is called a sapphire.

Below are the examples of sapphire colors. Note that every other color except blue is considered a “fancy” color.

Blue Sapphire

B6271 | medium

Fancy Purple Sapphire

U10834 | medium

Fancy Orange Sapphire

U11615 | medium

Fancy Yellow Sapphire

U11558 | medium