Country's foreign exchange reserves rose by $631.5 million to $352.02 billion in the week to September 18 due to rise in foreign currency assets, according to RBI data. In the previous week, the reserves had jumped by a healthy $2.358 billion to $351.389 billion. Foreign currency assets (FCAs), a major component of overall reserves, grew by $592.7 million to $328.560 billion in the reporting week, the RBI said. FCAs, expressed in dollar terms, include the effect of appreciation and depreciation of non-US currencies such as the euro, pound and the yen, held in the reserves.