Star Sapphire Gemstone Information
STAR SAPPHIRES
Star Sapphires are gorgeous and enthralling gemstones that show a distinct star ray across the face of the stone.
The star in star Sapphires is caused by a phenomenon called Asterism. When viewed with a single overhead light source star Sapphires will show a six rayed star pattern. In most of the cases the star can be clearly under natural light, but it can also be viewed using a strong source of direct light such as a penlight or a halogen bulb. This pattern is caused by microscopic inclusions created by the internal "silk" (rutile needles) that reflect the light. Unlike the other sapphires star sapphires are not translucent.
The microscopic inclusions are the crucial factor that reflect the light in a specified pattern to make six rayed pattern to which is looked like star when the light is over headed from a focal point. Other specialty of the star sapphire is that the star will move with the light source to an extent when the stone is turned around.
Star Sapphires naturally occur in a hexagon, six sided crystal. When the microscopic inclusions (silky or milky) grown inside the Sapphire, they tend to grow from each corner of the hexagon. Due to this natural hexagonal crystal arrangement star Sapphires always parade six rays.
When selecting star Sapphires to purchase it is important to understand what increases value in a stone. Firstly, the most important part of star Sapphires is the star. A very sharp and well defined star is hard to find, so a perfect star in a stone will always increase the price.
The colour and clarity of star Sapphires has a major influence on the overall price. A stone with a very transparent body is extremely rare and will fetch a high price. The best star Sapphires will have a blue transparent body with a nice deep blue colour and a sharp and vibrant star. These types of stones are extremely rare and can fetch tens of thousands of dollars.
Sri Lanka being the premium and large exporters of blue sapphires produced the largest star in the world. Star of lanka a grayish-blue star sapphire weighing 193 carats and was discovered in the century in Sri Lanka originally owned by Allan Kaplan who sold the gemstone to the Royal Ontario
Grayish Blue star of India originally found in Sri lanka is a masterpiece amongst the star sapphires weighing at astounding 563 Carats donated by J.P Morgan which is being presently displayed in American museum of Natural History.
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