Bisbee (?) Spiderweb (?) Turquoise & Sterling Ring, Flea Market Find 4 Bucks

Only stamp is 925.

http://www.alltribes.com/kcenter/types-of-turquoise.html

"Bisbee Turquoise was mined for many years as a byproduct of copper production in the enormous open pit mine and surrounding areas oped by Phelps Dodge Corp. The vast majority and the highest quality turquoise was found in the famous Lavender Pit copper mine. Bisbee turquoise is famous for its deep sky blue color and its purplish-chocolate brown matrix. The chocolate brown spider-webbed stones with deep sky blue color are among the most prized turquoise stones ever available."

https://nativeamericanjewelrytips.wordpress.com/2015/04/30/what-is-spiderweb-turquoise/

"What is Spiderweb Turquoise?
Spiderweb Turquoise is a term used to describe turquoise that looks like a spiderweb. It is not associated with any one mine, but many mines, some of the most notable being Kingman, Number 8, Lander Blue, Lone Mountain, Candelaria and others."

Looking forward to comments.
Bonnie