The Indian equity benchmarks reversed early losses in noon deals led by gains in index heavyweights like Reliance Industries, Infosys, Tata Consultancy Services, Tata Steel, Dr Reddy's Labs and HDFC. The Sensex rose as much as 686 points from the day's lowest level and Nifty 50 index was trading above 17,250 after hitting a low of 17,091 in morning deals ahead of weekly expiry of index futures and option contracts.