This specific 3D model, "Marquise Art Deco Ring 3D print model order", 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: 11.3 MB), 3DM (Rhinoceros 3D, filesize: 7.4 MB)