When it comes to color, the saturation is more likely to decrease when opacity increases. But, it the rutile silk is too intense, it will affect the stone’s overall clarity grade, which will consequently reduce its value. If the rutile silk is present in the proper amounts, the sapphire gem will be entirely transparent. Clarity, on the other hand, is a more delicate feature, mainly determined by the intensity of the rutile silk (the white, star-like asterism). In terms of hardness, this sapphire variety ranks 9 on the Moh’s scale, which confirms that it is a durable stone that can be freely used for making fine jewelry. There are certain sapphire specimens that have 12 star-like rays instead of six.
As for the six-rayed star, it is always white, with the exception of a few specimens, like the Thai star sapphire, whose asterism is exhibited in an authentic gold hue. However, they are present in extremely low quantities, which is the reason why these sapphires are mostly seen in blue color. These inclusions are mainly composed of rutile, a mineral that is present in almost all optical effects in gemology.Īlthough blue is the most common color appearance of star sapphire, this unique gemstone can be also found in other shades, such as yellow, orange, green, pink, purple, gray and black. Then, the needle-like inclusions appear and the most impressive thing about them is that they can be seen from all angles. (*in astrology, asterism is defined as a group of stars that form a specific pattern on the sky.) Asterism can be exclusively seen when the gem is viewed under direct natural light. Its one-of-a-kind feature is called “asterism”, an optical phenomenon displayed in a form of a six-rayed star on the stone’s surface. Star sapphire is a unique variety of sapphire, considered the rarest sample of the gemstone’s remarkable blue color. Who knows, maybe it will be your stepping stone to making it your next jewelry purchase.
And what other precious stone it could be than the one and only, star sapphire ? If you have never had the opportunity to meet this sensational gem in person, the least you can do is to learn about its intrinsic nature. But, there is always at least one specimen that stands out in the crowd, thanks to a specific characteristic that makes it not just different, but also universally appealing. The reason why gemstones come in so many color varieties is to offer consumers a multitude of possibilities to pick the one that will ideally match their personal taste and style.
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