A small Onyx Agate square wrapped in raw copper and sealed. The copper won't tarnish, but stay nice and rose-colored.
Onyx Agate Square
Tallest & widest dimensions
1 3/4" by 1 1/4"
About the copper
I used pure copper wire, then polished, cleaned and sealed the piece, so that the copper will never tarnish or rub off on your skin.
You won't need to polish your pendant, just keep it protected from scratches and bumps against hard surfaces or other jewelry.