It is watertight and ready for printing/milling. Although there are some slight undercuts, it was created with molding and casting in mind. Nominal size (although easily adjustable in any 3D software) is:
Pendant: 51.34mm wide/54mm tall / 8.96mm deep
Medallion: 60mm wide/ 60mm tall / 9.46mm deep
If you need any more information about the product, please contact me, thanks.