Vintage retail Turquoise pendant

Product Name: Vintage retail Turquoise pendant
You get this beautiful large turquoise what I think is sterling silver pendant, I could not find a 925 marking although I can't imagine what other metal this could be the turquoise itself is not flat it has dips in it not sure if that's the way it's supposed to be I do know the shape of the metal follows the shape of the turquoise that may be an indication that retail this is done purposely when designed please see pics and ask questions before purchase returns will not be accepted.