Czochralski Pulled Ruby Faceting Rough

3 years ago
129

Laboratory created (True, Cultured) Czochralski Pulled Ruby, fragment (bottom part) of 90 mm in diameter boule/crystal. This is the historical Union Carbide laser ruby ordered by Pentagon in 80-s. Material is flawless; pigeon blood color with true vitreous-adamantine luster of polished surface

Chemical composition AI2O3 + Cr
R.I. = 1.766 - 1.774
Specific gravity: 3.97 - 4.05
Mohs Hardness 9
Crystal system: Hexagonal

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