C. 1970's modernist artisan sterling silver ring with a raw tumbled chrysocolla specimen. The chrysocolla specimen is a gorgeous dark green-black, with veins of light green and turquoise. Brilliantly and securely kept in place simply with two bands of sterling that are tension-held by the outward curving open band. A meditation on form and nature. 

Size 3.5, resizable. 12.86 grams