Natural turquoise sterling silver size 6.0 ring

This is an amazing genuine natural South Western turquoise sterling silver size 6.0 ring. The turquoise has a gorgeous blue green color with tiny specs of pyrite. It is quite large for such a dainty ring. Stamped STERLING for sterling silver and C & R for the manufacturer’s mark. There is a hairline natural cavity on the top corner the stone that is visible with 10x magnification (please see all the close up pictures). This is not a crack or a break but a natural part of the turquoise stone structure with the pyrite. In great vintage condition.