Black Star Sapphire 2 Carat

2.00 €

Star Sapphire is a type of sapphire that exhibits a star-like phenomenon known as asterism. Star sapphires contain intersecting needle-like inclusions that cause the appearance of a six-rayed star-shaped pattern. The inclusions are typically the mineral rutile, but in black star sapphire, it is inclusions of hematite that cause the star effect. To cause a star, the inclusions form in parallel and tightly packed groups. The reflection from each group of crystals forms a straight line which appears to float on the surface of the stone. There are always three groups of crystals which intersect at 60-degree angles from each other. The three lines connect in the center to form the appearance of a 6 ray star. The presence of a star is one of the most remarkable phenomena encountered in the world of colored gemstones. This optical occurrence is quite rare, being only found in a very small percentage of the sapphires mined around the world. Top grade star sapphires are very popular with collectors. When looking to buy a star sapphire, note that the value depends not only on the carat weight of the stone but also the body color and visibility and intensity of the star. The black star sapphire from Thailand is quite unique in having a gold (rather than white) star.

  • Stock Number: 1084545638982
  • Gem Stone: Black Star Sapphire
  • Origin (where mined): Thailand
  • Weight: 2 carats
  • Shape: Oval
  • Measurements (mm): 6.23 x 4.72 x 2.7mm
  • color: Gold-Black
  • Brightness: Opaque

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