Natural Black Spinel

Hard and high polished a great substitute for black diamonds.

Mohs hardness: 7.5 - 8
Refractive index: 1.719
Specific gravity: 3.6 - 4.1
Treatment: None  
Heat Sensitive: None
Care: Usually safe for ultrasonic and steam cleaning

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

Beliefs associated with spinel are protective stones that assist in re-establishing relationships and resolving issues, help the wearer to put their ego aside in devotion to another person.