The second major article resulting from GIA’s research on the assessment of cut in round brilliant diamonds deals with the appearance aspect fire, which the authors define as “the visible extent of light dispersed into spectral colors.” Fire is well illustrated by these loose diamonds (2.00–3.03 ct), shown in a combination of diffused and spot lighting. The attractive brooch (a total of 55.07 ct of round brilliants, with a 10.59 ct center stone) is shown on a background of chromatic flares similar to those used in this research to help quantify the amount of fire in a specific diamond. Loose diamonds courtesy of Julius Klein, Ishaia Trading Corp., and Rick Shatz Inc.; photos © Harold & Erica Van Pelt—Photographers. Jewelry courtesy of Graff Diamonds; photo by Penny Vernon, Virtual Diamonds Ltd. Background image photographed by Al Gilbertson.