My wife always stops by when we visit, mostly October, and has a nice collection of their pieces. Last 2 times, it was a guy selling the goods (I think he's the owner), other times it's been different sales ladies.

Always located in the same place when we visit--as you're heading towards the mall from the market, there's a breezeway through which Rosemary's in on the right. The garnet stand is on the left right before the breezeway.