The owner Edmund Auyeung appears to be friendly and tries to help you, but if you try to haggle for a better price or ask him to source out diamonds, he'll embarrass you in front of his other clients and ignore you. That's what happened to me and I was furious. Not to mention on top of the fact that he was scamming some non-Chinese speaking clients of his because I heard the entire conversation he had with his other worker in Chinese about what to charge the foreigner!
ABSOLUTELY STAY AWAY FROM THIS PLACE!!!