In the five years since Gems & Gemology published the first comprehensive article on fracture-filled diamonds, many tens of thousands of stones treated by this method may have entered the market. Now more than ever before, the jeweler-gemologist must be able to identify filled diamonds and know how to work with them. The lead article in this issue addresses the effectiveness of fracture filling, key identification techniques, and the results of research into how some filled stones react to certain conditions of jewelry manufacturing and wear. It is the most complete research report published to date on this important topic. This information is critical to protecting the integrity of untreated diamonds, like those shown on the cover. All of this jewelry was designed and manufactured by Martin Gruber Designs for Nova, Van Nuys, California. The pear-shaped diamond (2.71 ct) ring is courtesy of Tivol Jewelers, Kansas City, Missouri. The Cross Over Fantasy bracelet contains 208 diamonds with a total weight of 18.40 ct; the three-row platinum Mystery bracelet has 199 diamonds with a total weight of 21.77 ct; and the rings have a total of 17.27 ct of diamonds. Photo © Harold & Erica Van Pelt—Photographers, Los Angeles, CA.