Everyone would agree that exposure and focus are the most critical aspects to consider when photographing gems or jewelry. But there are two other practices that take this kind of photography even further: lighting and positioning of the gem or jewel. The first component ensures a successful photograph. The second makes a picture interesting – or even compelling.
- Direct lighting works best for ornamental materials, and occasionally to provoke dispersion in a transparent gem. It is also sometimes used to bring out gemstone phenomena such as asterism (a star effect) or chatoyancy (a cat’s eye effect).
- To exhibit a gemstone’s best color, lighting should be diffused rather than direct. This can be achieved by placing a translucent white glass, plastic, or cloth between the light source and the gem.
- A mix of direct and diffused lighting can add drama to a photograph by adding some sparkle or dispersion to a transparent gem, while also bringing out its finest colors.
- When photographing highly polished metal, the shiny surfaces can be challenging, especially with direct lighting. Diffused lighting often works well to exhibit soft tonal gradients in the metals, and highlight the designed metalwork.
- Gemstones are cut and fashioned to show their best colors when looking straight down at them, perpendicular to the table of the gem. If the gems are cut as cabochons (a gem with a rounded, unfaceted, polished surface) and have asterism (a six-rayed star created when light hits inclusions in the gemstone), it is best to light them in a way that centers the star in the middle of the stone. With carved materials, there is much more latitude with the direction in which a piece can be photographed, but even there it is important to discern what the artist’s principal objective is. Talking to the cutter or designer is important.
- When positioning jewelry, it is important to consider the jewel’s salient characteristics: is a diamond or a colored gemstone the centerpiece? Can you observe the designer’s intentions through the way you position the jewel, and the camera relative to it?
- The camera angle may also be used as a tool: photographing “straight on” is important for documentary style photographs. To captivate a viewer’s imagination, the subject may be turned, or the camera angle skewed, to obtain dramatic results.