I recently acquired a batch (200 carats) of 1-2 carat blue sapphires. They are currently semi-translucent. I sent a batch of 20 pieces or so to Sri Lanka for heat treating, and about half of them turned out excellent, gem-quality sapphire. Unfortunately, the process they used was hardly scientific, and was therefore unreliable from one batch to the next. Combined with concerns about theft, I am looking for another avenue for heat treating without purchasing my own equipment.
The mine I buy from can supply a few hundred carats every few months, and I have a ready market for all the gem-grade sapphire I can produce — I’m just missing a suitable heat treatment option. Does anyone here heat-treat or know someone that could provide this service?
Thanks in advance!