The following 3D model is known as "Oval Solitaire Ring 3D print model 19" and is associated with author "Unknown author".
Can be downloaded at "Unknown platform" by following the link.
This specific 3D model is provided under the "Unknown license" framework.
STL (Stereolithography, filesize: 3.18 MB), 3DM (Rhinoceros 3D, filesize: 4.08 MB)