Jewelry

Gemstones are best photographed using a light source that illuminates the facets of the stone. If possible, back lighting should be used, particularly if the setting allows light to shine up through the stone.

Photographing against a dark grey or black background can make gold or silver appear more vibrant and add contrast and drama to the image, adding to it's appeal.

A softbox will create even illumination and may be a good investment for those who deal with jewelry on a regular basis.

A macro lens on a tripod will yield the best results.

Some helpful technical tips can be found here