A wholesale jewellery company owner, 55, had arrived about 3.30pm for an impromptu meeting.
He had a large suitcase with jewellery including rings, pendants, bracelets and necklaces from Italy.
He heard yelling from two men as he returned to his car after the meeting.
One man, with a closed fist, hit the owner’s left arm, leaving a small cut.
The men took the suitcase and fled the scene.
The men are described as Asian in appearance, 170-centimetres tall with dark hair; one is about 45, the other about 35.