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3D3DGem cut aluminum oxide (corundum).
These are real rubies and sapphires purchased from 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%