Time Worn Signet Ring in Sterling Silver with Red Banded Sardonyx Size 9

Vintage time-worn sterling silver signet ring. It is set with a deep blood red banded sardonyx stone. It looks almost black onm but in the sun you can see the color. This ring has a floral design that is worn smooth.  Stone has shallow surface scratches from wear. Size 9 Face measures 5/8" wide. Weight: 7.9 grams. No hallmarks. Acid tested. C. 1920.