Diamond, Ruby, and Emerald. Like the Ruby it is a form of corundum. As such, if it feels like you have heard some of this before from a previous post you might have. Anyways, on with the post!
Well, now that you know about the colour of Sapphires and where they come from it is time to move on to some more important things. Like all gems Sapphires have inclusions. If they do not have these you may be looking at a synthetic Sapphire. Unlike Rubies though, most Sapphires do not have lead glass filling, fracture filling, or any other form of inclusion filling treatment. Why is this? Because by heating the Sapphire not only does it increase the blue colour of the stone, it also loses what jewellers call the silk of the stone. What is the silk? The silk is what is causes the inclusions to be visible. When heated it vanishes and the stone becomes clear. The practice of heating Sapphires is so common that if it is NOT heat treated it will sometimes come with a certificate saying
that it was not heat treated rather than the other way around. Sapphires have been heat treated has been going on since the time of the Roman Empire. As such, it does not reduce the price of the stone. If any treatment that the Sapphire receives has an effect on the stone, be it a negative or a positive, it must be disclosed in accordance to the USFTC.
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