India's forex reserves jumped USD 1.634 billion to USD 618.937 billion for the week ended January 12, the Reserve Bank of India (RBI) said on Friday. In the previous reporting week, the overall reserves had declined sharply by USD 5.89 billion to USD 617.3 billion. The country's forex kitty had reached an all-time high of USD 645 billion in October 2021. The reserves took a hit as the central bank deployed the kitty to defend the rupee amid pressures caused majorly by global developments since last year. For the week ended January 12, the foreign currency assets -- a major component of the reserves -- increased USD 1.859 billion to USD 548.508 billion, the data said. Expressed in dollar terms, the foreign currency assets include the effect of appreciation or depreciation of non-US units like the euro, pound, and yen held in the foreign exchange reserves. Gold reserves were down USD 242 million to USD 47.247 billion during the week, the RBI said. The Special Drawing Rights (SDRs)