This specific 3D model, "Women Light Weight Ring STL OBJ FBX JCD Details 3D print model 18", is an asset made available by "Unknown author".
Can be downloaded at "Unknown platform" by following the link.
Usage of this 3d asset is subject to the "Unknown license" agreement.
STL (Stereolithography, filesize: 32.5 MB), OBJ (OBJ, filesize: 71.8 MB), RIB (Renderman, filesize: 764 KB), FBX (Autodesk FBX, filesize: 9.87 MB), JCAD (JewelCAD, filesize: 421 KB)