Sapphire Black Star | BKK Gemstones

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The black star sapphire like all other sapphires belong to the group of minerals known as corundum, a crystalline form of aluminum oxide (Al2O3), that is after diamond, the hardest known natural substance, with a hardness of 9 on the mohs scale. Corundum crystallizes in the hexagonal system, resulting in pyramidal or rounded barrel shapes. Like diamonds, corundum was formed billions of years ago deep inside the earth, below the earth‚Äôs crust and in the mantle, under conditions of high temperature and pressure. Subsequently, when the magma cooled down it formed igneous rock deposits and the corundum was incorporated in these deposits. Later as the igneous rocks were transformed into sedimentary and metamorphic rocks the corundum was also incorporated into these rocks. Continuous weathering and erosion of the rocks over millions of years released the corundum crystals which were washed down the hills and deposited in the flood pains of rivers as alluvial deposits. The star effect or asterism in star sapphires is caused by abundant microscopic inclusions mainly rutile, a natural form of titanium oxide (TiO2), aligned in a three fold pattern inside the stone that reflects the light entering the stone through its dome shaped face, into a six-rayed star pattern.

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Black Star Sapphire 1.51ct 7.8mm x 5.8mm, Opaque 6 Ray Star Oval $15.10 456B004	Black Star Sapphire 1.02ct 7.1mm x 5.0mm, Opaque 6 Ray Star Oval $15.30 456A010	Black Star Sapphire 1.54ct 8.0mm x 6.0mm, Opaque 6 Ray Star Oval $15.40 456B001
Black Star Sapphire 1.67ct 7.6mm x 5.2mm, Opaque 6 Ray Star Oval $16.70 456B006	Black Star Sapphire 1.71ct 8.1mm x 6.1mm, Opaque 6 Ray Star Oval $17.10 456B002	Black Star Sapphire 1.87ct 8.0mm x 6.0mm, Opaque 6 Ray Star Oval $18.70 456B007
Black Star Sapphire 1.57ct 7.0mm x 5.0mm, Opaque 6 Ray Star Oval $23.55 456A003	Black Star Sapphire 1.60ct 6.1mm x 3.8mm, Opaque 6 Ray Star Roun $24.00 456A023	Black Star Sapphire 1.65ct 8.2mm x 6.1mm, Opaque 6 Ray Star Oval $24.75 456A031
Black Star Sapphire 1.66ct 8.1mm x 6.0mm, Opaque 6 Ray Star Oval $24.90 456A001	Black Star Sapphire 1.76ct 8.0mm x 6.1mm, Opaque 6 Ray Star Oval $26.40 456A029	Black Star Sapphire 1.89ct 8.0mm x 5.7mm, Opaque 6 Ray Star Oval $28.35 456A004
Black Star Sapphire 1.89ct 8.2mm x 6.0mm, Opaque 6 Ray Star Oval $28.35 456A014	Black Star Sapphire 1.92ct 8.1mm x 6.1mm, Opaque 6 Ray Star Oval $28.80 456A011	Black Star Sapphire 1.99ct 8.1mm x 6.0mm, Opaque 6 Ray Star Oval $29.85 456A016
Black Star Sapphire 2.04ct 8.0mm x 5.8mm, Opaque 6 Ray Star Oval $30.60 456A028	Black Star Sapphire 2.16ct 8.2mm x 6.0mm, Opaque 6 Ray Star Oval $32.40 456A009	Black Star Sapphire 2.19ct 7.9mm x 5.9mm, Opaque 6 Ray Star Oval $32.85 456A020
Black Star Sapphire 2.20ct 8.0mm x 6.0mm, Opaque 6 Ray Star Oval $33.00 456A018	Black Star Sapphire 2.21ct 8.0mm x 6.0mm, Opaque 6 Ray Star Oval $33.15 456A015	Black Star Sapphire 2.26ct 8.1mm x 6.1mm, Opaque 6 Ray Star Oval $33.90 456A030
Black Star Sapphire 2.27ct 7.8mm x 5.9mm, Opaque 6 Ray Star Oval $34.05 456A032	Black Star Sapphire 2.29ct 8.1mm x 6.0mm, Opaque 6 Ray Star Oval $34.35 456A022	Black Star Sapphire 2.31ct 8.1mm x 6.1mm, Opaque 6 Ray Star Oval $34.65 456A008
Black Star Sapphire 2.34ct 8.0mm x 6.0mm, Opaque 6 Ray Star Oval $35.10 456A019	Black Star Sapphire 2.44ct 8.2mm x 6.0mm, Opaque 6 Ray Star Oval $36.60 456A013	Black Star Sapphire 2.46ct 8.0mm x 6.0mm, Opaque 6 Ray Star Oval $36.90 456A017
Black Star Sapphire 2.46ct 8.0mm x 6.1mm, Opaque 6 Ray Star Oval $36.90 456A002	Black Star Sapphire 2.65ct 8.1mm x 6.0mm, Opaque 6 Ray Star Oval $39.75 456A012	Black Star Sapphire 2.61ct 9.1mm x 7.0mm, Opaque 6 Ray Star Oval $52.20 457B002

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