I built an elaborate copper frame for this small flat moss agate "donut" bead, and placed a pearly glass bead in the center.
Moss Agate & Glass Bead in Copper
Tallest & widest dimensions
2.0 x 1.6 inches or 65 x 40 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.