Bisbee again?

I purchased these earrings as being “Bisbee” and paid a pretty penny for them, maybe 10 years ago. I’ve been bothered as to the simplicity of the silverwork, on such a quality stone? How would I check to see if they are a natural stone, treated stone, or a manufactured stone? Marked Sterling only. Seems to be a more modern setting, rather than an older one. Cabochons are 1& 3/16" x 13/16".

The stones look legit and lots of great turquoise is in simple settings. This color looks more Kingman than Bisbee.

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