This year, 236 dedicated readers participated in the 2005 Gems & Gemology Challenge. Entries arrived from all corners of the world, as readers tested their knowledge on the questions listed in the Spring 2005 issue. Those who earned a score of 75% or better received a GIA Continuing Education Certificate recognizing their achievement. The participants who scored a perfect 100% are listed below. Congratulations!

AUSTRALIA Grange, South Australia: Barbara Wodecki • BELGIUM Diegem: Guy Lalous. Diksmuide: Honoré Loeters. Hemiksem: Daniel De Maeght. Koksijde: Christine Loeters. Overijse: Margrethe Gram-Jensen. Ruiselede: Lucette Nols. Tervuren: Vibeke Thur • BRAZIL Rio de Janeiro: Luiz Angelo • CANADA Bobcaygeon, Ontario: David Lindsay • ENGLAND Hereford: Michael Langford. London: Douglas Kennedy • FRANCE Draveil: Claire Carpentier • INDONESIA Jakarta: Warli Latumena • ITALY Ferrara: Sonia Franzolin. Padova: Marco Maso. Porto Azzurro: Diego Trainini • THE NETHERLANDS Rotterdam: E. Van Velzen • POLAND Lublin: Marek A. Prus • SPAIN Valencia: Monika Bergel-Becker. Rocafort: Elvira Orts Rodriguez. Salou: Santigo Escolá SWEDEN Jarfalla: Thomas Larsson • SWITZERLAND Lausanne: Thierry Christe • THAILAND Bangkok: Surachart Panjathammawit, Potjana Sawangjidr • UNITED STATES Arizona Chandler: LaVerne Larson. Cottonwood: Glenn Shaffer. Tucson: Molly Knox. Yuma: Crystal Young. Arkansas Greenbrier: Beverly Brannan. California Burlingame: Sandra MacKenzie-Graham. Carlsbad: Abba Steinfeld, Jim Viall, Lynn Viall, Philip York, Marisa Zachovay. Culver City: Veronica Clark-Hudson, Judith Shechter-Lankford. Fremont: Ying Ying Chow. Fullerton: David Le Rose. Marina Del Rey: Veronika Riedel. Oceanside: Kevin Nagle. Orange: Alex Tourubaroff. Pacifica: Diana Gamez. Rancho Cucamonga: Sandy MacLeane. Redwood City: Starla Turner. Connecticut Vernon: Joe Thon Negs. Florida Clearwater: Timothy Schuler. Deland: Sue Angevine Guess. Sun City: Jeanne Naish. Hawaii Honolulu: Brenda Reichel. Makawao: Alison Fahland. Illinois Normal: William Lyddon. Indiana Carmel: Mark Ferreira. Fishers: Laura Haas. Greenfield: Rachelle Kihlstrum. Indianapolis: Wendy Wright Feng. Maryland Burtonsville: Jody Tebay. Gaithersburg: Marvin Wambua. Massachusetts Uxbridge: Bernard Stachura. Missouri Perry: Bruce Elmer. New Jersey Clifton: Jason Darley. New York Hawthorn: Lorraine Bennett. New York: Carolyn van der Bogert, HyeJin Jang-Green, Wendi Mayerson, Anna Schumate. North Carolina Candler: Christian Richart. Ohio Dayton: Michael Williams. North Ridgeville: John Schwab. Toledo: Mary C. Jensen. West Jefferson: Carolyn Loomis. Pennsylvania Leesport: Lori Perchansky. Schuylkill Haven: Janet Steinmetz. Yardley: Peter Stadelmeier. Rhode Island Rumford: Sarah A. Horst. South Dakota Piedmont: Randell Kenner. Tennessee Clarksville: Kyle Hain. Knoxville: Nicole Hull. Texas Plano: Kristina Oberg. Virginia Hampton: Edward Goodman. Herndon: Lisa Marsh-Vetter, Stephen M. Vetter. Washington Ferndale: Candice Gerard. Millcreek: Nicki Taranto. Redmond: Andrea Frabotta. Wisconsin Beaver Dam: Thomas Wendt. Mequon: Katie Molter • ZIMBABWE Harare: Lesley Faye Marsh.

Answers (see pp. 74–75 of the Spring 2005 issue for the questions): 1 (b), 2 (d), 3 (b), 4 (a), 5 (d), 6 (c), 7 (b), 8 (c), 9 (b), 10 (a), 11 (c), 12 (d), 13 (c), 14 (a), 15 (d), 16 (c), 17 (a), 18 (d), 19 (a), 20 (b), 21 (d), 22 (c), 23 (b), 24 (a), 25 (c)