Multi color Sapphires

Multi color Sapphires belongs to the corundum family. There are a wide variety of colors: colorless, pink, orange, yellow, purple, black …

Yellow corundums are called yellow sapphires. Green corundums, green sapphires.
Be careful, blue corundums are simply called sapphires. On the other hand, red corundums are called: rubies.

The color of sapphires depends on the proportions of chromogenic elements included in the chemical composition of the stone (titanium, iron, vanadium, chromium …).

• Mohs hardness : 9

• Color: All colors

• Crystal structure: Hexagonal (trigonal)

• Luster: Vitreous (glassy) to adamantine (diamond-like)

• Transparency: Transparent to opaque

• Refractive index: 1.757-1.779

• Specific Gravity: 3.99-4.10

• Cleavage: None

• Fracture: Conchoidal

• Streak: White

• Luminescence: Fluorescence present in all but black, green, and most blue sapphires (natural), varying degrees in all colors (synthetic); X-ray colors in some specimens

• Pleochroism: Present & very strong in most colors; Color shifts depend on stone’s color

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