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Frequently Asked Questions(2)

hg38hg.com Why are sapphires subjected to heat?
In an age-old practice that may have started in Sri Lanka roughly two millennia ago, sapphires are heated in order to improve their clarity and deepen their colors. Most sapphires out in the market today have been heat-treated.
How do the costs of heat-treated sapphires compare to those that are unheated?
Because of the rarity of unheated sapphires, the value of these gems is very high. Its rarity, not its beauty, have made unheated sapphires collectors items and the costs are usually triple the price for an equally beautiful heated gem.
There are famous diamonds, are there famous sapphires too?
One of the two most famous sapphires is housed in the Smithsonian Institute in Washington DC . Called the Logan Sapphire, this 423-carat cushion cut stone is set in a brooch surrounded by diamonds.
The other famous sapphire, a 259-carat bright blue Sapphire, originally from a Russian crown, is kept in the Diamond Fund in Moscow , Russia .
Can sapphires be called color changeEgems?
Some, but not all sapphires can be categorized as color change gems, meaning these gems can change colors from blue to red, or green to yellow, in an instant depending on light conditions. Not all sapphires have that quality. Color Change Sapphires come from the Mogok Stone tract in Upper Burma , and also from the gem fields of Africa . Incidentally, despite being called fancy sapphireEsapphires with different colors are real gems too.
I've heard of Controversial Sapphires, what are these?
Controversial Sapphires are products of gem heaters of Thailand . By adding a catalyst during heating at extremely high temperatures these gem heaters were able to create these beautiful sapphires, which are almost identical to the rare padparadscha gem.
What is the Mohs' Scale
The Mohs' Scale is a system of measurement, which was developed by German mineralogist Fredrich Mohs (1773-1839). The scale measures the relative hardness (or softness) of a mineral. Based on the Mohs' Scale, the diamond is the hardest mineral with a hardness factor of 10. It is followed closely by corundum (rubies and sapphires) whose hardness factor is measured at 9.


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