This specific 3D model, "Men Ring With Diamond Cut Center 3D print model get", is an asset made available by "Unknown author".
You can download this asset for free at "Unknown platform" by following the link.
The license for this digital asset is "Unknown license".
STL (Stereolithography, filesize: 4.6 MB), 3DM (Rhinoceros 3D, filesize: 5.62 MB)