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3D3DSynthetic ruby boule.
This is a lovely synthetic ruby boule cut in half. It's quite large, and said to be intended for use in making a ruby laser.
Source: eBay seller phumin2007
Contributor: Theodore Gray
Acquired: 1 December, 2008
Text Updated: 2 December, 2008
Price: $10
Size: 2.5"
Composition: Al2O3
Aluminum