Few stones are as truly lovely as the Star Ruby Sapphire. Ruby is from the same gem family as sapphire, a corundum, but when this color appears as red, the designation is the gemstone Ruby. The fascination of the starred surface of the stone is more than just an illusion; this is the phenomenon known as asterism in gems. These remarkable six-pointed stars come from the titanium dioxide impurities within the stone, inclusions made up of rutile threads in milky white “silk”. These appear when the gemstone is cut and polished into a cabochon. Faceting would remove the star, so gem cutters must work carefully to preserve this natural marvel.
Star Ruby Sapphire may be coral-red to pinkish-grape to deep scarlet. Like other corundum stars found in blue (sapphire), and some red stones (garnet and spinel), this star appears on cloudy, inclusion-loaded gemstones whose color is good and provides the perfect backdrop for the brilliant six-pointed star. In the Star Ruby Sapphire this may be a three- or even a 12-pronged or double star. Stars are best displayed with a single light source, and will appear to glide around the stone’s surface as the stone is moved. Linde Star Sapphires, including ruby, are artificially created, although this process ceased in the 1970s.
Star Ruby Sapphire is a very hard gemstone, coming in on the Mohs Scale at a solid nine, but care must be taken, as damage to the cabochon dome can also remove the star. Like other rubies, the background color of this unique stone may be deep pomegranate, pinkish, glossy blood red, or have a slightly grape purple. Like the inclusions that put the star in this gemstone, the perfect color for Star Ruby Sapphire is in the eye of the beholder.
Compound : Aluminum Oxide
Mohs Scale(Hardness) : 9
Found : Africa, Australia, Cambodia, China, India, Kenya, Madagascar, Myanmar, Pakistan, Sri Lanka, Thailand, Vietnam