Are engagement rings priced at a bargain in Korea?

My SO is traveling to Korea for business next week, and I have been waiting and waiting for him to propose. My current thought is this...He can get custom made clothes and leather goods relatively cheap over there, could he be waiting for this trip to purchase an engagement ring at a bargain? Are they cheaper over there then in the US? And if they are cheaper, are they still quality? He was stationed over there for years when he was in the Army so he is quite familiar with the area.