They are just different colors. To be fair, the fiery red color is a major differentiator and those stones that merely display a pale red or pink hue are known as pink sapphires and not rubies. The star shape is actually formed by intersecting needle inclusions. Sign up to receive exclusive updates and special offers.
Congratulations on joining our email list! You will be the first to know about exciting news, red carpet updates, special offers, and much more. In order to understand the uniqueness of this stone, one must understand the complex nature of the inclusions that give it its distinct feature. A mineral called rutile, which is comprised of titanium dioxide, usually causes the inclusions.
Proper cutting is critical for star sapphires, not only for their overall appearance, but to ensure a well-defined and properly oriented star. While most star sapphires remain untreated, they may be subjected to treatments to improve their color or artificially induce the star phenomenon. Star sapphires can be heated to intensify their color, but this must be done at modest temperatures and with extreme care, so as not to obliterate the star-inducing rutile silk.
A lovely blue-gray star sapphire and diamond ring. Since the price of transparent rough has escalated in recent times, most star sapphires are subjected to extreme heat and sold instead as transparent stones. For this reason, fine star sapphires are increasingly more rare and difficult to find. The best stones are translucent to semi-transparent. Color saturation decreases as opacity increases, so while opaque star sapphires may have very bright, well-defined stars, their color can be dull and unattractive.
The most common stars have 6 rays, and rayed stars are considered exceptionally rare. Where Can They Be Found? A Ceylon blue star sapphire. When they are unearthed and stay in their original state, s tar sapphires are found predominantly in Sri Lanka, but also fine blue star sapphires have come from Burma. Black star sapphires have been found in Cambodia and India. These beautiful star sapphires are ideal stones to mount in all types of jewelry. From engagement rings perfect for nature-inspired and beyond trends, to earrings, pendant necklaces, and bracelets, star sapphires.
Blue Sapphire Engagement Rings. White Sapphire Engagement Rings. Pink Sapphire Engagement Rings. Purple Sapphire Engagement Rings. Yellow Sapphire Engagement Rings.
Green Sapphire Engagement Rings. Blue Green Sapphire Engagement Rings. Peach Sapphire Engagement Rings. Padparadscha Sapphire Engagement Rings.
Montana Sapphire Engagement Rings. Other Colors of Sapphire Engagement Rings. Popular stones like blue sapphires, rubies and emeralds have always overshadowed this fine gem. It has something to offer beyond the pure brilliance and fire of a diamond. The beauty of the star that appears under bright light is fascinating and almost sorcery. This article intends to serve as a start to finish guide on the finer details of star sapphires.
The phenomena known as asterism is what makes the star sapphire a true marvel. Star sapphire belongs to the gem type known as corundum. Corundum is chemically made out of Aluminium Oxide. However there could be traces of foreign materials like titanium oxide otherwise known as rutile that gets included into the corundum during the natural formation process.
These rutile grows almost as tiny needles inside the corundum. When illuminated with light, these tiny needle like rutiles of the gem reflect the light and create the rays that give birth to a magnificent star. In other words the asterism of a sapphire occurs due to the chemical impurity of the gem. More commonly you can find intersecting 6 ray single star sapphires. In rare occasions, apart from usually expected rutile impurities we can also find gemstones with traces of hematite and ilmenite that can create a twin star.
A good star sapphire is almost always subjective and a matter of personal opinion. But it is necessary to establish some basic parameters to help judge the quality of a star sapphire. Star sapphire can vary between being transparent to translucent and completely opaque. More silk means more opaqueness of the sapphire which tends to produce an inexpensive gemstone.
However a certain amount of silk or rutile is needed for the stone to exhibit the asterism. Therefore the judgement of a quality star sapphire becomes quite tricky.
Other main factors are the intensity of the body color and the sharpness of the star. Blue and red ruby star sapphires are considered expensive when coupled with evenly legged strong asterism. These desired attributes are not so common in nature. Thus came about the production of synthetic star sapphires with enhanced colors and prominent stars. This is variety of sapphire which exhibit a unique optical phenomenon called asterism.
Black star sapphires owe their stars and also their dark colouring to included crystals of the reddish-black mineral, hematite. They can be found in a huge array of colours and hues just like transparent sapphires from various tones of blue to pink, purple and even grey and black. The most desirable colour, like with transparent sapphires, is a vivid, intense blue and these sapphires get their beautiful colouring from the minerals iron and titanium while vanadium gives a violet to purple colour.
A small amount of iron results in a more yellow or greenish tone, while chromium produces fine pink to red tones. Iron and vanadium together result in golden to orange tones. The Thai star sapphire is famed for its beautiful golden rayed star. A rough sapphire can only be cut and polished when it has the right amount of rutile.
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