I have the kodak dual lens camera and I wanted to know which setting is best for taking pictures of jewerly?

Macro will give you the best detail if you are closer than 3 feet to your jewelry. Also, using a flash will likely dull the shot, so you can rig your own lighting set up or buy one. I work at Ritz Camera and we have a mini light studio, or you could improvise backgrounds with sheets that can also double as diffusers for your lighting. Your camera should also have some settings for different lighting situations, so change your white balance setting for whatever light you are in to reduce any yellow/green hues.

While looking on the Kodak website http://www.kodak.com/eknec/PageQuerier.j... I found a bunch of "pocket" duel-lens cameras, but I don't know which model you have. Perhaps you can identify the correct one from the pictures on the page.
Having said that, it looks like your camera has similar settings to mine. I would use the close-up function if you want lots of detail, but if the piece if really shiny and reflects the flash too much, try it with no flash, or in the museum setting.