The model is created in Zbrush The stylised pendant and skull bas-relief is available in OBJ and STLNominal size of the merged medallion (although easily adjustable in any 3D software) is:
pendant skull 40.995mm wide/ 49.976mm all / 10.908 mm deep
pendant 40.995mm wide/ 49.976mm all / 3.396 mm deep
skull bas-relief 21.013mm wide/ 32.324mm all / 9.094 mm deep
Feel free to ask me any questions about the model you might have