Two-time world champion Thomas Daley of Britain finished seventh.
After winning gold in the first 11 events, the lone event China didn’t win at the championships was the mixed 3-meter synchronized springboard, with the Chinese scratching earlier Saturday.
Matthew Carter and Maddison Keeney of Australia won with 304.86, their first time competing together. They edged Francois Imbeau-Dulac and Jennifer Abel of Canada, who finished 0.78 points behind for silver.
“I never expected that,” Keeney said.
Lou Massenberg and Tina Punzel of Germany took bronze at 301.62.
It was Keeney’s second medal of the competition. She finished third in women’s 3-meter springboard Friday.