Here's a model of 2 Rose Gold Diamond ring with a casket on top holding .90 cent diamond within, i.e. for a groom and bride with an Arnold lighting and texture, with minimum polygons and vertices so the file would not be much big and easily accessible and editable.
MA (Autodesk Maya, filesize: 1.07 MB), OBJ (OBJ, filesize: 1.33 MB), FBX (Autodesk FBX, filesize: 628 KB)