This specific 3D model, "Solitair Ring Bridal Set 3D print model 57", 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: 12.3 MB), 3DM (Rhinoceros 3D, filesize: 3.78 MB)