Boulder opal teamed with a glass bead handmade by Lisa joy Sachs. Both the bead and the opal have a heartbeat design. It is synergistic! The bezel on the opal is 22k gold and the underbezel and everything else is 14k gold. It has a lobster claw clasp and is strung on facetted sapphire beads with amethyst accents. I see this as a serious piece of art jewelry!