Hallmark on Mens Turquoise Ring

Not sure of the hallmark. Any help with any details would be great! Thanks in advance!

Hello, beautiful ring. It is a popular Zuni style done by a handful of artists. I am having trouble making out the hallmark, do you have a feeling of what it is?

No hallmark is visible in your photo

Yes, both of these rings have different hallmarks. Just showing that the style is done by a handful of Zuni artists.