Enhancements
Blue star sapphire is always heat treated to produce, intensify or lighten color and/or improve color uniformity and appearance. Occasionally diffusion is used to produce asterism.
More information on gemstone enhancements.
Blue Star Sapphire Belonging to the corundum family, Blue Star Sapphire is a 9 on the Mohs scale of Hardness which makes it among the most durable of all gemstones. A cabochon cut blue sapphire displaying a 3 ray, 6 point star.
Blue Star Sapphire Mohs' Hardness of 9. The mineral is corundum. A cabochon cut blue sapphire displaying a 3 ray, 6 point star.
Finest quality blue star sapphire in the 5 carat range was selling for about $2500-3000/ct (wholesale) in 1990.
Commercial grade stones (whitish or grayish blue, poorer star) of similar weight sold for $50-300/ct.
Blue Star SapphireA blue sapphire formed from corundum and rating a hardy 9 on the Mohs Hardness Scale. A cabochon cut blue sapphire display a 3 ray, 6 point star. Value is impacted by the color, visibility, and intensity of the star.
Very fine blue star sapphires are known to come from Burma as well. These stones often come in large sizes and can be exceptionally expensive in fine qualities. Black star sapphires come from Cambodia and India.
 See also: Star, Star Sapphire, Sapphire, Color, Stone
  
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