This is a Fossilized Coral stone. I set the stone using fine silver against a simple brass curve and accented the bottom of the curve with two cubic zirconias.
The pendant is 2 1/2 inches tall by 1 inch wide. It will come with an 18 inch black rubber cord with copper end clasps.
I bought the stone from one of my favorite stone cutters and here is what he said about this stone: "This is a gorgeous cab made from fossil agatized coral from Indonesia. Please don't worry about the harvesting of this stone harming ocean coral beds. That horrible practice involves a different kind of coral altogether. These are dead millions of years ago and now on the jungle floor. Agate has replaced the coral and now they are just chunks of cool rocks."