Hallmark clarification & identify turquoise

I recently purchased this pendant in Santa Fe and hoping someone can help make sense of the hallmark and identify the turquoise. The stamped hallmark is a single letter G, which appears to be the mark of several artists, but it also has a sticker crediting Geraldine James as the artist.
I also want thoughts on the type of turquoise because I’ve gotten conflicting answers.

Geraldine James is the daughter of Marcella James and this looks to be her style. She does lots of work for Running Bear here in Gallup, which sells to many Santa Fe wholesalers. It has a really good look. I think the reason you have conflicting answers on the turquoise is because you just don’t have enough rock their to see defining mine characteristics. If I had to make a guess I would call this Kingman. Hope this helps.