Number 8 Turquoise Sterling Silver Ring.  The Number 8 Turquoise Mine is located just North of Carlin, Nevada.  It is one of the more rare tourquoise stones due to the closure of turquoise mining in this deposit.
Artist Stamped -  Zia
Approximate Dimensions -
Size - 9 but is adjustable
Centerpiece - 1 1/4" by 7/8"