Southwestern Turquoise Onyx Sterling store Ring Signed 4.5

Beautiful Southwestern style ring featuring turquoise and black onyx inset in sterling silver. I believe it's black onyx anyway, but I'm not positive. There's a hand-written mark store on back that looks like "JT" to me.

3/4" high in the center, and it's a size 5 1/2 to 6. Weighs three grams on my scale and is in beautiful condition with just some light tarnish.