This specific 3D model, "Princess Engagement Ring 3D print model get", is an asset made available by "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: 8.8 MB), 3DM (Rhinoceros 3D, filesize: 7.93 MB)