This specific 3D model, "Women Ring Render 3dm STL MTL SLC JCD OBJ FBX Details 3D print model 81", is an asset made available by "Unknown author".
You can download this asset for free at "Unknown platform" by following the link.
Usage of this 3d asset is subject to the "Unknown license" agreement.
STL (Stereolithography, filesize: 72.7 MB), OBJ (OBJ, filesize: 165 MB), 3DM (Rhinoceros 3D, filesize: 37.7 MB), RIB (Renderman, filesize: 1000 KB), JCAD (JewelCAD, filesize: 143 KB), FBX (Autodesk FBX, filesize: 22.3 MB)