His Jewel is a Pair of Crossed Keys, signifying he is the Collector and Distributor of all Lodge Monies as he holds the keys to the cashbox.
The Treasurer of a Masonic Lodge is the Chief Financial Officer of the Lodge. He sits to the right of the Master and behind the Senior Deacon. The Treasurer is responsible for all financial transactions. He receives all money, pays all debts by order of the Worshipful Master with the consent of the lodge and renders a report when requested.
The Treasurer's duties can be likened to a corporate C.F.O. (Chief Financial Officer). The Treasurer of a Masonic Lodge is an elected officer of the Lodge.