This specific 3D model, "Diamond Ring for Women 3D print model 16", is an asset made available by "Unknown author".
Can be downloaded at "Unknown platform" by following the link.
This specific 3D model is provided under the "Unknown license" framework.
STL (Stereolithography, filesize: 33.9 MB), 3DM (Rhinoceros 3D, filesize: 28.6 MB)