Black Star Sapphire Gemstone

Make offer black star sapphire diamonds and 14 k gold ring vintage size 6 1 4 1960s 12 9 g black star sapphire halo ring in heavy 18k yg setting w 24 old cut diamonds 11g 1 199 00.

Black star sapphire gemstone.

You can read more about asterism in our phenomenal gems article. 9 0mm x 7 2mm x 4 5mm deep shape. The rutile inclusions in the black star sapphire which give it its mystique also result in a vitreous luster when cut as cabochons and polished. This however is not true.

Sbkg119 natural color star sapphire gem weighs 3 41 carats star sapphire gemstone size. 187 55 this natural black star sapphire cabochon gem shows a very well developed six rayed star when viewed under incandescent bulb light or under direct sunlight. Black star sapphire gemstones are typically opaque. Black star sapphire gemstones are one of the most durable materials and can be worn daily in any gemstone jewelry including daily wear rings.

Many people think that black star sapphires are an entirely different gemstone. Black star sapphire s striking star phenomenon is just one reason for this gemstone s popularity. Star sapphire is a type of sapphire displaying an optical star like effect. The black star sapphire is an oval shaped gemstone cut as a cabochon like all other star sapphires the center of the star is much bigger and brighter than normal star sapphires.

Parti sapphires show two or more colors. This effect is caused by asterism. From this page you can filter the results further by using the left hand menu. Black star sapphires are black sapphires that display asterism.

By using the top menu you can search by origin carat weight size price and other factors to enable you to find the exact gemstone that you are looking for. The black star of queensland named after its nature and place of origin is a 733 carat 146 6 g black sapphire and was the world s largest gem quality star sapphire until the star of adam was discovered. This effect is caused by asterism. Although black sapphire is not a very popular or sought after gemstone this is not the case for black star sapphires.

Black sapphire vs black star sapphire. As with all sapphire it s also extremely durable having a hardness of 9 on the mohs scale. Sapphire is a precious gemstone a variety of the mineral corundum consisting of aluminum oxide α al 2 o 3 with trace amounts of elements such as iron titanium chromium vanadium or magnesium it is typically blue but natural fancy sapphires also occur in yellow purple orange and green colors. Sapphire has a specific gravity of 4 00 a refractive index of 1 76 1 78 and birefringence of 0 008.