Here's some information that I've gathered on torch firing gemstones or lab-grown gemstone in pmc. You'll see where some stones survived and some were damaged. I'm thankful that someone else has tested this before I went on to suffer more losses. Even some stones that have a Moh's hardness of 7 or higher still aren't safe to fire unless they're gem quality of A or better. One lab-created stone that I was shocked about was Moissanite...I definitely would've thought this stone could've withstood the heat.
Also, I was surprised to really find only one site that mentioned allowing the piece to cool rather than quenching it in water to keep from damaging the stone. This was definitely a rookie mistake on my part, which I hope to never happen again.....though I happily wore my pendant with the cracked cz's today to work and even received compliments on it :)
I've hyperlinked the pictures to the sources where I found the information. By clicking on the pictures it'll take you to the sites that offer kiln firing information as well.
Hope this info helps!
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