Photographing jewellery

[molinari]

Hello,

I'm hoping for some tips/advice on photographing jewellery. I've been asked to take some photos for a website by my brother. If he could, he'd have them taken professionally but he doesn't have the money, so of course I'd like to help if I can. I'm more used to wildlife and landscape photography so it would be good to get some tips or advice from anyone on here. I expect there to be a fair amount of time on the setup of the shot, getting the lighting correct for shadows, DoF, exposure etc... but equipment wise....

What I have:
Nikon D90
Nikon 18-105 kit lens
Nikon 35mm F1.8 lens
Nikon 70-300mm lens
A recently purchased 80cm light box (as found on ebay)
RedSnapper tripod

I guess I will also need:
Some lamps for either side of the light tent, perhaps another one for straight on or from above?
Would a macro lens be better or would that be an unnecessary level of detail?
Reflective card for the items to sit on

Is there anything else I might need? Any advice or info is welcome .

Below is an example of the type of jewellery I'll be photographing:

 

[molinari]

Thanks for the replies!
Yes, black velvet and other material will be used to see how it looks. Now I need to find some decent continuous lights to use in the setup. The macro bellows also sound interesting.