This specific 3D model, "Antique Art Deco Engagement Ring 3D print model get", is an asset made available by "Unknown author".
Can be downloaded at "Unknown platform" by following the link.
The license for this digital asset is "Unknown license".
STL (Stereolithography, filesize: 17.6 MB), JCAD (JewelCAD, filesize: 1.25 MB)