- The chemical formula of Blue sapphire is aluminum oxide (Al 2 O3).
- The specific gravity ranges between 3.99 and 4.00 and the refractive index range is between 1.760-1.768 and 1.770-1.779.
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The hardness on the Mohs scale is 9. It is the next hardest mineral,
diamond being the hardest.
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BLUE SAPPHIRE NEELAM PRICE:
- Regular Quality Blue sapphire ( Neelam ) Gemstone Price Starts from Rs 1500 per Carat onwards.
- Fine Quality Quality Pukhraj ( yellow Sapphire) Gemstones Price Starts from Rs 4000 per Carat.
- Super Fine Quality Pukhraj ( yellow Sapphire) Gemstones Price Starts from Rs 7000 per Carat onwards.
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