Second was Auckland's Sylvia Jiang representing New Zealand, third Ayesha Gough of Australia, and fourth Xuan He of China.
Miss Jiang, 18, also won a special prize offered by Sir Michael Hill, a keen supporter of the competition, and open to New Zealand entrants.
She has been offered return air fares to Queenstown, accommodation at Sir Michael's lodge at Arrowtown, and a chance to play on his classic Steinway.
Sir Michael, who started his career as a jeweller in Whangarei, quipped that the winner of his prize would have to put up with being mentored by him.
The encouragement award went to Daniel Le of Australia and the people's choice award to Lucy Zeng (China/New Zealand).
The contest is held every two years. Its patron is the renowned classical pianist Michael Houston. Contestants must be aged under 28.