The revised rules, which will not be mandatory, have been sent to the finance ministry for approval, Vachira Arromdee told reporters.

"This is to provide more options for gold investors, such as for online trading," she said.

The baht rose by 0.2% to 31.31 per U.S. dollar a 0510 GMT.

(Reporting by Kitphong Thaichareon and Orathai Sriring; Editing by Martin Petty)