Geodes form from bubbles in Volcanic Rock. Time takes care of hardening the sphere and water precipitates minerals inside. The top of the ring measures 1 1/4" lengthwise on the finger and 1 1/8" across. She has a pretty little textured band which I've oxidized and buffed to bring out the detail. Currently, she's sized at a US Size 9, however, I can adjust the size for you up to a US Size 12.
All Rings are bench made by me, Margaret Aden, using Fine Silver (which is 99.9%) which I then Oxidized in my special sauce. Let me know what size you'd like and I will adjust it before shipping.