Radiologic imaging properties of various gemstones

Differences in the radiologic appearance of diamonds compared to other gemstones such as cubic zirconia have been noted, but the radiological imaging properties of many gemstones have never been systematically examined. Here, the radiologic imaging properties of a variety of gemstones are assessed using digital radiology (DR) and computed tomography (CT). Radiodensity was assessed by calculating greyscale values (GV) from DR images with standardized acquisition parameters. Results show that gemstones with higher densities are more radiodense. Diamonds were found to be the least radiodense, while many common diamond simulants were found to be the most radiodense. Especially when superimposed with anatomical structures, diamonds are very difficult to detect using radiology. CT imaging, however, can improve differentiation between diamonds and surrounding tissues, possibly making it useful for detecting diamonds concealed on/in a person, and was also useful for identifying irregularities in gemstone surfaces such as chips, divots, and natural surfaces.