The spinel has only been recognized as an independent material for around 150 years. Previously, he was caught under the rubies. Large stones are rare. Among his outstanding features is his extraordinary sparkle.

SPINELL
Colour: red, yellow, brown, blue, green, black
Mohs hardness: 8
Density: 3.54-3.63
Transparency: transparent to opaque
Fracture. Muscular, uneven.