Taking good quality pictures of jewelry for most is an unsolved mystery. However, there are some simple techniques used by the professional, which even amateur photographers can use to obtain dramatic results with minimal effort. The following examples show the basic setup that should allow anyone to achieve results they can be proud of. These images were all taken using a Canon Digital Rebel camera with a 100MM lens.
The basic setup we used included an EZcube light tent to soften the shadows and eliminate glare, while providing a clean and clutter free background. We used TabletopStudio lights as the primary light source, equipped with true color daylight balanced compact fluorescent bulbs. We also used a special Diamond dazzler LED bulb to light up the diamonds and faceted gems in the example images on this page.
The keys to good jewelry photography are sharpness, lighting, exposure, and in the case of gemstone photography, creating some sparkle. More details: http://hozhonigallery.com/articles/take-photos-of-jewelry.html