A digital macro selection is also helpful. The macro setting is important for shooting jewelry because it gives an exceptionally clear, detailed, almost microscopic, view of each bead.
Finally, make sure your camera has an exposure setting. Shooting sparkly jewelry can be a challenge, so being able to experiment with a shot's light exposure can make the difference between a muddy photo and a crisp, bright one. Read the "Pixel Perfect" article for more tips on digital photography for jewelry.