Here’s a link where the differences were discussed.
Possible Turquoise Type?
I’m still of the feeling that they probably would have used the same turquoise all throughout the concho belt. And again, we are all just making educated guesses. But it is fun to guess 
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@Jason may I kindly ask your expertise, please? Sorry to just pull you in.
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Gorgeous belt and I think you bought it for an excellent price! 
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Have gone thru the photos again. @Jason stated
However, the big clue is how thin the cut is. Pilot is a thin vein and that is why you see these really thin cuts with lots of host rock.
Looking at those two stones in my belt, I believe these have been “direct neighbors” in the vein, on top of each other.
Looks like the cabochon are rather thick, from the existing photos I would guess about 5mm = .2", or more.
So it was likely not a “thin vein”, in both dimensions, pointing us towards Royston.
Will post better photos once I have the belt.
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Turquoise is always tricky. I bought a bag of Emerald Valley Turquoise from a cutter once that looked just like this. I tried to do a quick google search to find something that looked like it, not a perfect match.
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Thanks a lot, so maybe best would be to ask the artist himself. Anyone a clue how to contact Neal Paquin (assuming he’s still active in the business)? Maybe he’s even proud of we ask him about his work …
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Maybe look for him on Facebook? I’m not familiar with him, and I can find very little about him online. The origin of the stones may always be a bit of a mystery.
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I believe I read that the Emerald Valley mine is in the area of the Royston mine.
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Not really what I had hoped to hear, but, LOL, your best guess is still really valuable, for sure.
Thanks a lot, @Jason .
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I would guess any of the above except Ithaca Peak. There’s no way to know for sure.
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That was the recommendation of Bing Copilot when I asked about Neal Paquin’s most used turquoise. LOL.
Well, I don’t trust Bing 
I imagine Bing would only find what’s online, and I hardly found anything. And the little I found was on sites like eBay and Etsy where people don’t know what the heck they’re talking about regarding turquoise. That’s just my 2 cents worth.
People online usually seriously don’t understand that you can’t be sure what mine turquoise is from without good provenance. They try to guess, and often just pick a famous mine. I like to look and have fun guessing, and then stop worrying about it.
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So true! Take these Persian stones for example, and the author’s comments, from the 1975 book, Turquoise Treasures: The Splendor of Southwest Indian Art.
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