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I must comment here and will probably be refuted, but, in my many
years of collecting, polishing and setting turquoise, I have found it
nearly impossible to identify by examining in person, much less by
pictures, most turquoise. Many "experts" will state positively that
the stone in question is from such and such mine, and while most
mines do have some characteristics in general, many mines have a wide
variety of stones coming from the same vein.
While the identity of the stones you are setting is not critical,
you should be wary of anyone positively identifying from pictures.
Since I live and work in New Mexico and have an ongoing love affair
with turquoise, I would be interested in seeing some pics if you
would care to email me some.