The Omani Rial is the official currency of the Sultanate of Oman . It consists of 1000 Bz issued by the Central Bank of Oman . Its use began after the Gulf rupee was discontinued. It is a currency and paper currency, banknotes in circulation: 1 riyals, 5 riyals, 10 riyals, 20 riyals, 50 riyals.