The only natural turquoise in this bunch is the 3mm cabochons. The turquoise and brass cabochons are reconstructed, or 'pressed' turquoise, and what that means is that turquoise chips and powder is bonded with plastic resin, dyed and then baked, cut and polished.  I'm stocking this because I think it's really eye-catching and unusual, but the fact that it is reconstituted is clearly reflected in the price.  Currently I have it in two colours; black and turquoise.