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The main sources are Sri Lanka (Ceylon), Burma (Myanmar), Madagascar, Tanzania, Australia and Thailand.At one time exceptional sapphires came from Kashmir, but no new material has been found there for about 100 years.Blue Sapphire is one of the classic colored gemstones and is always in fashion.It is valued for its vivid color, its excellent hardness (9 on the Mohs scale) and its rarity.Sapphire has a specific gravity of 4.00, a refractive index of 1.76 - 1.78, and birefringence of 0.008.
Blue sapphire colors range from pale blue to cornflower blue to royal blue, navy blue and midnight blue.
With a loose stone you can much more easily inspect the gem and see it for what it really is.
In this way you can get a better idea of its true worth and be sure you are paying a fair price.
Three axes are at 60 degrees to each other in the same plane.
The fourth axis is perpendicular and unequal in length to the other three.
The prices and value of blue sapphire vary depending on the size and quality of the gemstone.