Natural Ruby Cabochon

July birthstone, these cabochon Rubies are high quality, well cut. Great for jewelry design. These genuine gemstones will help you create beautiful finished cabochon jewelry.  Beliefs, Ruby brings love, confidence, loyalty, and courage.

Hardness: 9
Refractive index: 1.76
Specific Gravity: 4.0
Dispersion: .018 medium
Species: Corundum
Heat Sensitivity: None
Treatment: Heat Treated

Metal Clay, safe to fire.
Test results; Silver 1200F-1HR-OK, Silver 1475F-1HR-OK, Silver 1650F-2HR OK,  Bronze 1525F-2HR-OK, Copper 1778F-30min-OK