These are offered in the street market in Granada. Told to be from Guatemala. Did not ask for the price. Look like reconstituted turquoise. But nice. Wanted to show.
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So I see some Bahamas turquoise 
Seriously the stones with black matrix make me think Chinese turquoise.
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Had the same first impression but then saw the scratches on the top stone which seem to be white. On the other hand the seller knocked them hard on other stones to show it’s not plastic.
Thanks. Always interesting to see what is being offered elsewhere.
Just my opinion: The back and blue cabs have a totally fake look to me. I think I see a piece of rhodonite in the mix. I love the scientific tapping method by the seller. Best wishes buying but beware.
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Have not bought any. Good decision. Anyway will have hundreds of good opportunities in the US.