Nope, not a rock... this freeform cabochon is red "art glass." The patterns in the glass suggest a flowing hot liquid, cooled down a bit by the cool Sterling Silver wrap. A cascading topper tumbles down onto the cabochon. This cab is redder than it appears in the photo; once things slow down a bit after our recent move, I'll get it re-photographed.

This pendant is 2-1/8" high and 7/8" wide.