A pretty marquise (that's the shape of the stone) of dragon vein agate - mostly purplish blue with touches of pink.
Blue Dragon Vein Agate Marquise
Tallest & widest dimensions
2.2 x 1.0 inches or 50 x 28 mm
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.