Marketmen said pick up in demand and fall in supply at physical markets mainly encouraged traders to raise their holdings.
At the National Commodity and Derivatives Exchange counter, gur prices for far September contract hardened by Rs 31, or 2.47 per cent, to Rs 1,286 per quintal, with an open open interet of 1,283 lots.
Most active near July contract rose by Rs 15.50, or 1.27 per cent, to Rs 1,240 per quintal, having an open interest of 6,520 lots.