The overall reserves had increased by USD 1.45 billion to USD 294.98 billion in the previous reporting week.
For the week ended November 30, the gold reserves slid by USD 386.2 million to USD 27.80 billion, the RBI said.
Similarly, the core foreign currency assets, a major part of the reserves, also dropped by USD 125.7 million to USD 260.01 billion, the central bank said in its weekly statistical supplement.
Foreign currency assets expressed in US dollar terms include the effect of appreciation/depreciation of the non-US currencies, such as the euro, pound and yen, held in the reserves, the apex bank said.
For the week under review, the special drawing rights (SDRs) were up by USD 26.9 million to USD 4.430 billion, while the country's reserve position with the IMF was up USD 13.7 million to USD 2.264 billion, the RBI data showed.