This specific 3D model, "Solitair Ring Bridal set 3D print model 37", 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: 40.2 MB), 3DM (Rhinoceros 3D, filesize: 29.9 MB)