Identification of Turquoise Tab Necklace

Picked these up at an auction and know absolutely nothing about them. Any information would be greatly appreciated.

This is nice. The turquoise looks it could be Turquoise Mountain. We use to have a Navajo lady that sold something similar to use. With the cost of turquoise going up you just don’t see these as often. I would guess this necklace has some age, 20+ years. Most likely this is Navajo strung. Hope this helps.