This specific 3D model, "Solitaire Engagement Art Deco Ring 3D print model 78", is an asset made available by "Unknown author".
Can be downloaded at "Unknown platform" by following the link.
The licensing terms for this digital asset are governed by "Unknown license".
STL (Stereolithography, filesize: 40.2 MB), 3DM (Rhinoceros 3D, filesize: 29.9 MB)