We have just purchased a rough cabochon quality blue Tanzanite, We are currently heating it and selecting the best stone for cutting. We have made 3 pendants with some large Tanzanites. I would like to list only the heated blue Tanzanite but if anyone is interested in it Before the heating please send us an email. We usualy take about 24 hours slowly heat the stones up to 600celcius to cause the natural reaction which turns this brownish/purple/grey stone to a beautiful Blue color. No chemicals are used only heat. If anyone is interested i can list a small parcel of the rough unheated. Just let me know. How many carats/grams you want.