Memory lockets are made from stainless steel and glass.
I offer 2 sizes of locket, 30mm and 25mm in diameter and these can have a
chain attached to wear as a pendant or be used as a key-ring
The lockets have a rubber seal making them waterproof
The top and bottom screw together making them more secure than lockets which close with magnets. Though I do recommend checking the tightness on a regular basis