Foreign exchange reserves zoomed $4.121 billion to $218.956 billion during the week ended July 13, according to the weekly supplement released by RBI today.Foreign currency assets moved up $4.118 billion to $211.703 billion.Gold reserves and SDRs were unchanged at $6.787 billion and $1 million, respectively.Reserve position in the International Monetary Fund increased $3 millon to $465 million.