An unusual Edwardian Columbian emerald and full cut diamond circlet stick pin set in mille grain platinum and 18ct yellow gold. The stick pin is made up of a circlet of full cut diamonds mille grain set in platinum collets with a scalloped edge, the circlet is broken up with a square cut Columbian emerald set in a mille grained 18ct yellow gold collet. On a soft barley twist 18ct yellow gold stick pin.