Reply To: Heat Treating Sapphires › Forums › General Discussion › Heat Treating Sapphires › Reply To: Heat Treating Sapphires November 10, 2019 at 2:36 pm #5810 DavidRillingParticipant @DavidRilling This reply is probably too late but sapphire gallery in Philipsburg MT also does heat treating. I’ve had stones treated at gem mountain and at sapphire gallery and definitely prefer the results at sapphire gallery