African Barrick Gold and Polymetal International rallied as the price of gold continued to climb after reaching a two-month high at Thursday's close of European trading.Balfour Beatty rose following a decline earlier this week when it reported a first-half pre-tax loss.Anite, on the other hand, plunged after the software supplier for the wireless and travel industries warned of flat sales and lower profits in the first half of the year due to a slow start in the market for testing mobile handsets.SIG tumbled after the British insulation and roofing firm reported a drop in half-year pre-tax profits due to the poor winter weather earlier in the year.FTSE 250 - RisersAfrican Barrick Gold (ABG) 159.30p +7.64%Polymetal International (POLY) 758.00p +5.50%Balfour Beatty (BBY) 237.70p +5.18%Kazakhmys (KAZ) 314.20p +4.94%Berkeley Group Holdings (The) (BKG) 2,184.00p +4.70%Bovis Homes Group (BVS) 756.00p +4.49%Bellway (BWY) 1,392.00p +4.04%AZ Electronic Materials SA (DI) (AZEM) 315.50p +3.95%Ferrexpo (FXPO) 189.10p +3.45%Barratt Developments (BDEV) 310.90p +3.22%FTSE 250 - FallersAnite (AIE) 116.00p -7.72%Keller Group (KLR) 942.50p -3.43%JPMorgan Indian Inv Trust (JII) 313.50p -3.03%Rightmove (RMV) 2,235.00p -2.74%Sports Direct International (SPD) 629.50p -2.70%Enterprise Inns (ETI) 141.20p -2.15%888 Holdings (888) 153.90p -1.97%Ashtead Group (AHT) 615.50p -1.60%SIG (SHI) 175.20p -1.57%Savills (SVS) 609.00p -1.54%RD