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1  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Fascinating Facets / Re: Heat treating Montana Sapphires on: July 06, 2020, 01:24:04 am
HT-P (High temperature Pressure) sapphires were started for treatment in 2009. This treatment is not an easy treatment to do, according to our research, its a treatment that is very similar to the standard Heat treatment that is available readily in the market and since the difference is little (Especially with Microscope the traits were similar to those of traditional heat (Lotus Gemology, 2019). Interesting that this sapphire treatment that is capable of doing permanent deformation of the sapphire lattice, in particular crystallographic orientation, not maybe in the entire direction. So you know some people might say, we are using a kind of press which pushes sapphires from all directions. Ceramics in general, including sapphires are resistant to compression, but they are not resistant to tension. This is a property of all material with covalent or ionic bonding. But if you pull it, it would break apart quite easily or show deformation. In terms of sapphires its not so important even though you apply compression from all sides, you will still have tension components at particular crystallographic direction, because its an anisotropic material.

You can check out Heat treatment video at
2  Stone Talk / Moderator, Hummingbirdstones ( Robin ) / Fascinating Facets / Re: Faceting designs - collection of links. on: July 01, 2020, 10:46:36 pm
Thank you for sharing informative links.

Here, I would like to add one more link for Gem cutting - Emerald faceting.
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