Gemstones Guide.

G.Corundam group.
The chemical term is Aluminium oxide.Among the gems, ruby and sapphires belong to this group.Hardness is 9; specific gravity : 3.9 to 4. Lusture vitreous to adamantine.

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Sapphire

Gemstone Name : Sapphire

Description :
It is generally a brilliant cut.

Colour :The colours are blue, yellow and violet.Colour is due to the presence of iron and Titanium.

Hardness : 8; Specific gravity : 2.7

Found in : Sri lanka,Thailand and Burma.

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2.	Gemstone Name : Ruby. Description : It is generally a brilliant cut. Colour : The red colour of the ruby is due to chromium. Hardness : 8; Specific gravity : 2.7 Found in : Sri lanka,Burma and Thailand.

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