Hi what is the best place on line to buy cabochons and backing material for cabochons? I noticed on another thread someone mentioned that FMG is a good place to buy crystal and glass beads but not so good for semi precious stones. I am looking for cabachons in semi precious stone of all different sizes and shapes but want the quality to be good. I don't mind dyed stones or heated stones as long as the seller informs you of the treatments. And any advice on backing material would be helpful.