Gemstones Tools

Ruby

Ruby cabochon
(roo-bee)

12th c.; lat. rubeus

A deep red, transparent to translucent variety of the mineral corundum, highly valued as a precious stone
Color
Bright red, brownish and all kind of red to light pink
Family
Corundum
Chemical composition
Al2O3
Crystal system
Hexagonal
Hardness (Mohs scale)
9
Specific gravity
4 ±0,05
Refractive index
1,762 - 1,770 +0,008 -0,004
Birefringence
0,008
Optical character
Uniaxial -
Chanthaburi

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Jaipur

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