Pebble and sterling silver pendant

This special pebble was found on the beach as a perfect rectangle... Asking to be made into a classy pendant, set in sterling silver. 
This pebble was found on the Welsh coast near Aberdyfi and can be seen at the rear of the pendant also.  The sterling silver bezel has been handmade and will show signs of this in its individuality and uniqueness.
The pendant measures approx 27mm long, 15mm wide and 3mm thick.
The pendant comes on a sterling silver 18"chain (unless specified) and gift boxed.