Silver zoomed 500 rupees, to yet another all-time high of 57,500 rupees per kilo at Delhi's bullion market, today, on hectic buying by stockists and jewellers for the ongoing 'Navratra' festival, amid a firm global trend. Silver coins also spurted 500 rupees, to a new peak of 63,000 rupees for buying, and 63,500 rupees for selling 100 pieces.