When buying tableware in gold or silver (sold throughout Bangkok), be careful that you know what you're doing. Things can seem like a great deal but you may not be getting world-class quality. I would approach that with the same caution as buying jade. I'm not saying to avoid it entirely, just that you should make sure you know what you're doing.
One that's frequently on my list is mother of pearl decorative items-- coasters, little boxes, picture frames, spoons, massive oyster shells (holds most of my cufflinks), all kinds of things in beautiful pearl. You can also buy lots of actual pearls, but there again, best to really know what you're doing.