This is a widely accepted practice in the gem industry, and diffusion is applied mostly to a surface depth of about half a millimeter into the gemstone. Since it is so rare to find this gemstone in its natural occurring form, our blue star sapphires undergo a diffusion treatment to enhance the asterism effect. Of those three gems, only one will meet the standards to be called top quality. Only about three out of every 100 raw sapphires exhibit the star-effect. The blazing effects of asterism are strongest on the face of the gem when observed in daytime. Needle-shaped microscopic inclusions within the gem naturally align to reflect a six-pointed star. The word asterism comes from the Greek word "aster" meaning star. The opaque Thai blue star sapphire is carved with a rounded cabochon cut to accentuate its shining asterism properties. Thai blue star sapphire also exhibits pleochroism, meaning it appears different colors when viewed from different angles. This star can appear in any color but typically occurs in blue, black and pink gemstones. A select few sapphires have the ability to display a star-like spectacle referred as asterism. There are different types of sapphire available in the market and most of them have unique qualities pursued by many. The name sapphire is from the Latin "sapphirus" meaning blue. We invite you to view our full selection of sapphires, blue sapphire rings and custom sapphire jewelry and discover what makes the Natural Sapphire Company the world's greatest collection of natural sapphires.Sapphire, along with her sister gemstone ruby, belongs to the corundum group of gemstones, considered one of the hardest minerals on Earth. Our jewelry and gemological specialists will work with you from start to finish to create your custom sapphire jewelry. All of our sapphires are cut on our premises and are available loose or mounted in a custom setting.
We offer a vast selection of blue sapphires, pink sapphires, yellow sapphires, white sapphires and other unique natural sapphires. Our natural untreated sapphires offer true beauty, rarity and superior value compared to treated sapphires. Our sapphires are not synthetic, heated to extreme temperatures, diffused, irradiated, glass filled or oiled. At the Natural Sapphire Company we specialize in providing our customers with the finest quality natural sapphires.
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