Here’s a great gift – for yourself or someone else (suitable for men and women).
A modern keyring in a horseshoe shape has a ball end that screws off. Slide your key(s) on and screw the ball end back on. Solid and secure.
The other end has a small chain and square of black volcanic lava and you can even see a small quartz crystal embedded in the lava!
N.B. (The photo with the keyring with key attached is only shown for informational purposes).