This year, 285 dedicated readers participated in the 2001 Gems & Gemology Challenge. Entries arrived from all corners of the world, as readers tested their knowledge on the questions listed in the Spring 2001 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 Coogee, Western Australia: Helen Haddy. Nedlands, Western Australia: Eleanor Sanders. Slacks Creek, Queensland: Ken Hunter  BELGIUM Diegem: Guy Lalous. Diksmuide: Honoré Loeters. Hemiksem: Daniel De Maeght. Overijse: Margrethe Gram-Jensen. Ruiselede: Lucette Nols  BRAZIL Rio de Janeiro: Luiz Angelo  CANADA Cowansville, Québec: Alain Deschamps. Kingston, Ontario: Brian Smith. Oakville, Ontario: Alethea Simone Inns  CROATIA Zagreb: Sandra Crkvenac  CYPRUS Nicosia: George S. Stephanides  CZECH REPUBLIC Praha: Karel Mar⁄ík  ENGLAND Tenteroen, Kent: Linda Bateley  FRANCE Paris: Stephen Perera  GERMANY Amberg: Herbig Klaus. Idar-Oberstein: Josef Bogacz  HONG KONG Causeway Bay: Cristina O. Piercey  INDONESIA Ciputat, Jakarta: Warli Latumena  ITALY Ferrara: Sonia Franzolin. Porto Azzurro, Livorno: Diego Giuseppe Trainini. Valenza: Rossella Conti. Vicenza: Francesca Zen  LITHUANIA Vilnius: Saulius Fokas  NETHERLANDS Rotterdam: E. van Velzen. Wassenaar: Jane M. Orsak  POLAND Lublin: Marek A. Prus  PORTUGAL Algarve: Johanne Jack  SCOTLAND Edinburgh: James W.M. Heatlie  SPAIN Burjassot, Valencia: Luis E. Ochando. Madrid: Shahrazad Krewi de Urquijo. Oviedo, Asturias: Consuelo Laspra. Playa P. Farnals, Valencia: Monika Bergel-Becker. Port de Sóller, Baleares: J. Maurici Revilla Bonnin  SRI LANKA Gampaha: Nadee Abeykoon  THAILAND Conburi: Watcharaporu Keankeo  UNITED STATES Alabama Mobile: Lori Bryant. Arizona Tucson: David Arens. California Burlingame: Sandra MacKenzie-Graham. Carlsbad: Marla Belbel, Carl Chilstrom, Michael T. Evans, Diane Flora, William J. Herberts, Mark S. Johnson, Cathy Jonathan, Jan Lombardi, Lynn L. Myers, Diane H. Saito, Abba R. Steinfeld, Richard Taylor, Philip G. York. Los Angeles: Veronica Clark-Hudson. Marina Del Rey: Veronika Riedel. Pacifica: Diana L. Gamez. Penn Valley: Nancy Marie Spencer. Redwood City: Starla Turner. Santa Clarita: Beverly Nardoni-Kurz. Watsonville: Janet S. Mayou. Colorado Colorado Springs: Barbara Maffei. Connecticut Simsbury: Jeffrey A. Adams. Florida Clearwater: Timothy D. Schuler. Deland: Sue Angevine Guess. Vero Beach: Lisa N. Perino. Georgia Buford: Lisa Hazan. Decatur: Ella Golden. Hawaii Makawao: Alison Fahland. Illinois Danvers: Anne Blumer, William Duff. Mokena: Marianne Vander Zanden. Northbrook: Frank Pintz. Peoria: John Fitzgerald. Indiana Fishers: Laura D. Haas. Indianapolis: Mark Ferreira. Iowa West Des Moines: Frank Herman. Kansas Topeka: Ann Solcolofsky. Maine South Freeport: Arthur E. Spellissy, Jr. Maryland Darnestown: Ron Suddendorf. Massachusetts Braintree: Alan R. Howarth. Brookline: Martin Haske. Lynnfield: John A. Caruso. Michigan Saginaw: Veronica Haldane. Mississippi Hattiesburg: A. Thomas Light. Missouri Perry: Bruce L. Elmer. Nevada Las Vegas: Deborah Helbling. Reno: Terence E. Terras. New Jersey Fort Lee: Lioudmila Tretianova. New Mexico Santa Fe: Leon Weiner. New York City Island: Marjorie Kos. New York: John Kearney, Wendi M. Mayerson. Rye: Gregory J. Cunningham. North Carolina Creedmoor: Jennifer Jeffreys-Chen. Manteo: Eileen Alexanian. Matthews: Terry A. Edwards. Ohio Athens: Colette M. Harrington. Cuyahoga Falls: Catherine S. Lee. Oregon Salem: Donald Lee Toney. Pennsylvania Schuylkill Haven: Janet L. Steinmetz. Yardley: Peter R. Stadelmeier. Rhode Island Providence: Sarah A. Horst. Texas Austin: Judith Darnell, Anne Hawken. Corpus Christi: Warren A. Rees. Virginia Newport News: Sonia Brannan. Sterling: Donna B. Rios. Washington Poulsbo: Ruth Jorgensen. Seattle: Thomas C. Estervog. Wisconsin Beaver Dam: Thomas G. Wendt. Milwaukee: William Bailey

Answers (See pp. 79–80 of the Spring 2001 issue for the questions):
(1) c, (2) b, (3) a, (4) c, (5) b, (6) a, (7) a, (8) d, (9) b, (10) c, (11) c, (12) a, (13) a, (14) c, (15) withdrawn, (16) d, (17) b, (18) d, (19) a, (20) d, (21) b, (22) a, (23) a, (24) c, (25) c