After sawing up a gun barrel, we placed a large gemstone in the center. WOW it was a natural fit! When measuring which stone fit the setting we realized "OHHHHHH!!!! THAT is what 9mm means!!!! It is the inside diameter of the barrel!!" This comes in lab-created ruby, lab-created blue sapphire, and a lab-created padparadscha sapphire (orangish/ pink), all in handmade sterling silver on an 18" chain for 200-.
