He offered these six photo tips at the 2014 JCK Show in Las Vegas.
Camera and lenses – Use a high-end digital Single Lens Reflex (SLR) camera capable of shooting images 16 mega pixels and above. A 60-80 mm macro lens capable of 1:1 magnification makes it possible for you to focus on your subject matter from a distance of 5 inches or more. Weldon traditionally uses a 105 mm lens.
Lighting – Studio strobe lights, continuous lighting, LED lights and simple flash units give you a variety of lighting options. The investment in a system can be significant, so carefully consider how gems or jewelry will be lit, and how light interacts with them.
Stage – Create a platform or area where your subject will be photographed. Many photo supply companies sell pre-fabricated light boxes, or you can use a white cloth tent or cocoon made of translucent plastic, to control the environment and create diffused lighting, which scatters light, softens shadows and provides uniform lighting for your subject.
A consistent light arrangement and staging is ideal for appraisers and jewelers who want to catalog what they have worked on or record inventory in an environment that does not change. This provides consistency in the way the images look, but little in the way of creativity or artistic license.
Tripod – A tripod will help eliminate camera movement, especially with continuous lighting systems, and make it easier to compose the best possible photograph.
Tweezers, sticky wax or tape and gem cloths – Sticky wax and tape help the photographer address minute details, such as placement of the object on a stage. As in gemology, gem cloths are invaluable to clean a gem or remove fingerprints and dust. Tweezers are used to avoid getting new or more fingerprints on the gems, especially after they have been wiped with a gem cloth. Because items are magnified through macro photography, make sure such details to do not detract from the object.
Choose the best-cut stone or the most beautifully made jewelry. A well cut stone that doesn’t show light leakage take less time to prepare for the photo and is easier to position in a flattering manner. That said, it is always good to change the position of a jewel, and remember to document a piece from the front and back.
Carefully choose the material that will act as a background to your subject matter. You want to make sure you choose a material – fabric, stone, tile, glass, or wood – whose texture or color doesn’t compete with the object. A good rule of thumb: if the subject matter is light, choose a dark background and if it is dark, choose a light background. This will ensure there is high contrast between the object and the background, which is always appealing to the eye. Also, white backgrounds tend to have a more clinical feel, while black often adds a dramatic touch.
Successful is when a viewer likes the “mood” of an image but is not distracted by the background. Remember, your gem or jewel is the focal point and most import aspect of the photo.
Use props to tell the story of the piece. A cameo placed on ancient books, for example, conveys a sense of history. Make sure the colors of your props are different enough that the piece stands out from them or is complimented by them. You can also use props to establish the scale of the object.
Most images can be enhanced with a little bit of Adobe Photoshop work. This photo-editing software makes it possible for you to clean dust and remove glue or sticky-wax that may be showing. While this software can be used to change color, it should only be used to correct the color to match the actual gemstone. In some cases, items can be cut out of a background, or a halo-lighting effect can be used to create a mood or spotlight a special aspect of the piece. Photoshop can also be used to convert the format of the photo for various media (print, email and web).
Never use Photoshop to change the “truth” of a photo. For example, don’t take out inclusions, abraded facet junctions or dramatically change the color of a stone, such as altering a pink stone to a deep red. It is unethical to make such significant changes without disclosing that you have done so.
Keep trying. Author Malcolm Gladwell often refers to the "10,000-Hour Rule" in his book “Outliers,” saying the key to success in any field is due, to a large extent, to practicing a specific task for a total of around 10,000 hours. Applying that adage to photography, consistent “perfection” comes after your 10,000 image.
Amanda J. Luke is a senior communications manager at GIA. She is the editor of the GIA Insider and Alum Connect and was the editor of The Loupe magazine.