Cool, a year and a half later.
I just posted again to the same question on the American Craft Forum:
The best option to photograph jewelry is a DSLR with macro lens. A point and shoot with good macro can do it but they usually tend to have the macro setting at the wide end of the zoom which means you'll be within an inch or two to fill the frame. It's better to shoot from further back so as not to block your lighting. That means a DSLR.
For the DX sensor crop body which 99% if the DSLR's have, a macro lens in the 50mm to 60mm range would be good enough because there is a 40% to 50% crop factor built in. A 60mm macro on a Nikon D80/D90 would be the equivalent of a 90mm lens. Sometimes when I shoot jewelry, I end up using my 105mm or 200mm macro lenses instead of the 60mm macro on my full frame sensor body to get further back.
If you're not interested in the latest bells and whistles, look for a recently discontinued model camera. I'm a Nikon person so I would recommend the D80 over the newer D90 to save money. Or the D200 over the D300. Do not look at the D40, D40X, or D60 because they are limited to using lenses with the motors built in for autofocus, though you should always use manual focus photographing jewelry so you can control the focus point to get maximum depth of field.
Larry Berman
Digital Jury Services
412-767-8644