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UNUSUAL PROPERTIES: Similar to the Blue Sapphire, differs in that it has an aqueous inclusion in its makeup that creates a refracted five-pointed star on the stone’s surface. In case of Black star sapphires as well as Blue Star Sapphires, such a treatment is very common.
The overall appearance of such a sapphire becomes blue however the colored layer is very thin. This results in the diffusion of the chromophore in the surface of the gemstone thereby making the colorless sapphire have a blue surface layer. In the general treatment applicable to faceted stones, a coloring element also called chromophore is applied to the surface of a natural colorless sapphire and the stone is heated to high temperatures for 7-8 days. TREATMENT: One of the most common treatments performed on star sapphires is the diffusion process. The inclusion is often the mineral rutile, composed primarily of titanium dioxide. In Star Sapphire Gems, they are due to intersecting needle-like impurities. This format results from a phenomenon well-known as asterism, found in several types of gemstones. ORIGIN: The origin of the natural blue star sapphire is in MyanmarĬHEMICAL COMPOSITION: Al2O3 Corundum (Aluminium Oxide)įORMATION: A Star Sapphire is so named due to the appearance of a star-shaped format which presents itself when a single top-down light source lights the sapphire. NATURAL BLUE STAR SAPPHIREĬOLOR: Blue star sapphire has a lovely Blue Colour. Padparadscha is the name of a sapphire variation that is pinkish orange. Although blue star sapphires are the most common, they can also be colourless and come in grey and black. One of the two gem types of corundum, the other being ruby, is sapphire (defined as corundum in a shade of red). An uncut, unpolished yellow sapphire was discovered in Montana’s Spokane Sapphire Mine, far from Helena.
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