All of the âConchosâ (I donât know if that is the right term) are marked CB sterling. Feels very smooth as if they have been coated with something or very polished? I donât know if itâs stones or plastic. 
A quick search art the art- amerindien web page showed Clarence Bailon,
Santo Domingo, with a very similar hallmark.
The turquoise appears to be authentic. Possibly from Nevada?
Doesnât look like turquoise to me but I have no idea what it is. Waiting for someone else who might know to comment.
It looks like turquoise, just heavily stabilized. Like this, just big cuts Kingman Turquoise 5x10mm Oval Cabochons/ Sold Individually/ - Etsy
Whoah! Thatâs it! Whatâs your opinion on value?
Thanks for solving the mystery 
