Late entry - old piece sold at Oskar blues 12/16
Large Striped Onyx Agate
Tallest & widest dimensions
About the copper
I used pure copper wire, oxidized it to achieve a timeless "antiqued" look, and then polished, cleaned and sealed the piece, so that the copper will never tarnish any further 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.