Moh Hardness Scale: 8
Specific Gravity: 3.49 – 3.57
Refractive Index: 1.643
Colours: Yellow, Pink, Red, Blue, Brown
Commonly occurring in yellow varieties, this gem has been valued since antiquity, when the ancient Egyptians associated it with the sun god Ra.The birthstone of November, Topaz is very good ornament stone. It has sufficient hardness for all jewellery applications save rings. Blue topaz consistently ranks as the second most popular coloured stone after sapphire, while pink and red topaz are rare colour incarnations of the stone and can be quite costly.
In ancient times the word Topaz was used to refer to any yellow gem. This designation error eventually resulted in the convention of naming the genuine stones as precious Topaz.
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