Brett and his teammates from Devon Jamie Chestney and Louis Ridout beat Australia 14-12 in a tight final on Monday after cruising past Wales 17-5 in their semi-final. Wales beat Fiji 21-7 in the bronze medal match.
Brett (48) is the oldest member of the team and a former World Indoors Champion, but this was his Commonwealth Games debut.
England won all their group matches against Malaysia 13-12, South Africa 22-14 and Canada 36-8 before easing past Jersey 16-11 in the quarter-finals.