September 24 (SeeNews) - Cookware maker Metalac [BEL:MTLC] and insurer Dunav Osiguranje [BEL:DNOS] were the only blue-chip gainers on the Belgrade stock exchange on Tuesday, driving the bourse's blue-chip BELEX15 index higher by 0.36% to 1,122.18 points at close, bourse data showed.