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Gem cut aluminum oxide (corundum).
An example of the element Aluminum

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Gem cut aluminum oxide (corundum).
These are real rubies and sapphires purchased from http://www.pehnec.com in April 2002. Real because they are chemically and crystallographically indistinguishable from naturally occurring gems (that would cost well into 5 figures). Present in the table because they are man-made (real, but synthetic).
Source: Pehnec Gems
Contributor: Theodore Gray
Acquired: 23 April, 2002
Price: $15/both
Size: 0.6"
Purity: 53%
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