This specific 3D model, "Kids Heart Pendants 3dm STL OBJ FBX Renders Details 3D print model 4", is an asset made available by "Unknown author".
You can download this asset for free at "Unknown platform" by following the link.
The licensing terms for this digital asset are governed by "Unknown license".
STL (Stereolithography, filesize: 2.11 MB), OBJ (OBJ, filesize: 5.75 MB), 3DM (Rhinoceros 3D, filesize: 3.05 MB), FBX (Autodesk FBX, filesize: 955 KB)