Vintage 1970s Lost Wax Nugget Style Sterling Ring with Bright Lapis Lazuli Size 5 1/4

Vintage 1970s lost wax casting ring. It is nugget style and set with a deep blue lapis lazuli stone. Both the stone and the silver have a smooth, time worn patina.  

Size 5 1/4 and the face measures 1 1/16" by 3/4" wide. Weight: 13.9 grams. No hallmarks. Acid tested.