This specific 3D model, "Emerald Radiant Ring 3D print model 21", 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: 25.8 MB), 3DM (Rhinoceros 3D, filesize: 11.5 MB)