It seems like to be an old question, but there are some updates that we would like to provide in regards to heat treatment of blue sapphires. Since that is what this topic is about so the update must be done. Actually I was thinking about the new HPHT sapphire quite a bit - been researching, reading alot of information and finally I had found someone who is a specialist in material science and does alot of experiments on ceramics, heating, treatments himself. He wasn’t much in the trade but more towards the academic of side. His name is Mubashir Mansoor.
I then made a great connection with him and did a webinar and found many interesting facts about the HPHT blue sapphire. Notice how I understand that there is a confusion between HPHT / HT-P between a few labs and the industry, especially when GRS claimed that this treatment was causing the stones to be “weak”.
So we did a webinar on HPHT blue sapphires with Mubashir Mansoor - and this video is available to watch here: https://youtu.be/i4rb6u0V4-s
Hope this helps readers of this topic and any questions please send those over.
Mansoor, M., Agarwal N., Navneet Gems (2020). Heat Treatment of Blue Sapphire (The potential effects of pressure) [Video]