This pendant is a large apophylite rock from India.
 it measures 5 inches long and 1.5 inches at the widest point. It is prong set with heavy gauge sterling wire. It is very secure in its setting.
It hangs on a double brown leather cord that measures 17-20 inches depending on where you fasten the lobster claw clasp. The leather is finished with handmade Sterling endcaps and Sterling chain and lobster claw clasp.
The pendant is removable from the leather cord. 
Use the leather cord alone or put the quartz pendant on another chain/cord

Large apophylite set in Sterling silver on a double leather cord