Stunning Chrysocolla in Black Blue and Green in Sterling Silver Size 7

Vintage sterling silver Southwestern ring that is set with a stunning chrysocolla stone. It is a deep blue with strong black matrix. The blue looks like a lava flow through the matrix.  And it even gets better because there is green at one end! The setting is rustic and the the back is not soldered tight. It does not move, and is not broken, they just did not solder it to seal the seam. See side view.

Size 7. Face measures 1" long. Weight: 6.6 grams. Silver is tarnished. No hallmarks.