Lighter rings are available in sizes 7 and 11.5, which can be cast in gold or silver. You can also change the size in Rhino or Matrix software - print and cast and enjoy. (3dm-stl-obg-fbx)
3DM (Rhinoceros 3D, filesize: 9.51 MB), OBJ (OBJ, filesize: 47.3 MB), FBX (Autodesk FBX, filesize: 6.59 MB), STL (Stereolithography, filesize: 12.3 MB)