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It is extremely difficult to tell if a piece of Turquoise has been treated, there are several ways the stones are treated, also there are so many other types of stone passed off as Turquoise that it confuses even more. Knowing the source of material is a key especially for the high dollar stuff, I stopped in at Tony Cotner's room at the Tucson show (Damale Turquoise mine)and I looked at some fossil replacement Turquoise and Variscite valued in the tens of thousands of dollars.....I know that Danny Lopaki has cut many beads for Ernie Montoya a Southwestern mine owner and operator (Carico Lake Turquoise Mine)and I'm sure Danny can tell us about material we could only dream of holding, again stones in the thousands.....then the opposite end of the spectrum, the current crop of dyed Howlite (or Magnesite) is marketed as turquenite and sells for a few dollars a pound......good luck
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