Aug 23 (Reuters) - Gold extended gains above $1,900 on Wednesday, drawing support from a retreat in U.S. bond yields as investors positioned for guidance from monetary policymakers at the Jackson Hole symposium.

Spot gold firmed 0.3% to $1,903.60 an ounce by 1136 GMT, drifting higher for a third straight session. U.S. gold futures rose 0.4% to $1,932.60...[LINK]