This is one of the biggest jade markets in all of Asia, and is probably a much safer place to look for a good deal than Thailand or Hong Kong. Bargains are to be had here, but that said, if you don’t know what you are doing then don’t spent a lot of money!
Otherwise, the market is a great place to look around and admire the different styles of jade and many other precious stones. If you are looking to buy some jade, another option is the handicrafts center which also has a good selection (and accepts credit cards!)
There is also a small artist’s market nearby and of course the much bigger flower market.