Hallmark and Turquoise ID on Navajo Belt

An anyone help identify The multiple makers marks on this piece of turquoise jewelry I believe the DS is for Dorothy Seo but I’m not sure and I also do not know about the other Marques. I would also like to try and identify the Turquoise.

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Hmmm…the copyright c is throwing me off; I don’t believe she uses that or the other mark. That’s a big ol hunk of turquoise - I would guess Kingman.

I don’t know that this is Native American… doesn’t quite look right for Native made.