This has to be one of my favourite shapes ever - an Antique Quatrefoil Garnet Locket Pendant!As you can see, the front is fully engraved and centres a foiled garnet cabochon, with an intact glass locket back. The piece is crafted in 18ct gold during the Victorian period.
STL (Stereolithography, filesize: 41.6 MB), 3DM (Rhinoceros 3D, filesize: 132 MB)