Vintage solid sterling silver cast ring. It is rustic and reminds me of Navajo tufa stone casting. (It is not Navajo) It is set with a quartz rock crystal that has a "pools of light" effect in the sun. The back of the cabochon is carved. Lapidary work on the stone is primitive. May be older than the ring.
Size 7.5 Measures 5/8" long. No hallmarks. Acid tested Weight: 6.4 grams.