LONDON, Dec 11: Gold rose on Monday after hitting a three-week low, with bargain hunters and physical buyers supporting a market that remained vulnerable due to thin trading ahead of Christmas. Gold touched a high of $628.20 and a low of $622.60 before settling at $625.90/627.40 an ounce by 1056 GMT, against $624.70/626.20 late in New York on Friday, when it fell about $6.—Reuters