Selling jewelry and watches, one web or two web?

I'm going to sell Jewelry and watches. For jewelry, there are about 6000 items and for watches, there are about 1200 items.
Right now, I'm not sure whether I should include them in one webstie or split to two websites. Which one is better?
Any suggestions to give? I'll appreciate any ideas.

Stick to one site, much easier to make your marketing dollars work for you instead of dividing your resources.