This specific 3D model, "Women Ring MTL 3dm STL OBJ FBX Details 3D print model 35", is an asset made available by "Unknown author".
You can download this asset for free at "Unknown platform" by following the link.
This specific 3D model is provided under the "Unknown license" framework.
STL (Stereolithography, filesize: 5.04 MB), OBJ (OBJ, filesize: 13.7 MB), FBX (Autodesk FBX, filesize: 2.22 MB), 3DM (Rhinoceros 3D, filesize: 17.8 MB)