This year, hundreds of readers participated in the 2007 Gems & Gemology Challenge. Entries arrived from around the world, as readers tested their gemological knowledge by answering questions listed in the Spring 2007 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 here.

Congratulations!

AUSTRALIA Queensland, Cairns: Elizabeth Cassidy. Queensland, Gold Coast: Bert J. Last. Western Australia, Coogee: Helen Judith Haddy • BELGIUM Brussels: Brigitte Revol MacDonald, Sheila Sylvester. Diegem: Guy Lalous. Diksmuide: Honoré Loeters. Hemiksem: Daniel DeMaeght. Koksijde: Christine Loeters. Overijse: Margrethe Gram-Jensen. Ruiselede: Lucette Nols • CANADA Ontario, St. Catharines: Alice J. Christianson. Ontario, Kingston: Brian Randolph Smith • HONG KONG Causeway Bay: Cristina O. Piercey-O’Brien • INDONESIA Jakarta: Warli Latumena • JAPAN Tokyo, Koganeishi: Naoko Tokikuni • LITHUANIA Vilnius: Saulius Fokas • MYANMAR Yangon: Thuzar Aung • PORTUGAL Vila do Bispo, Algarve: Johanne Jack • SCOTLAND Edinburgh: James Heatlie, Alec Ewen Taylor • SPAIN Barcelona: Jose M. Sanchez-Lafuente. Valencia: Monica Bergel. Vitoria: Ignacio Borras Torra • SRI LANKA Kandy: Senarath B. Basnayake • SWEDEN Jarfalla: Thomas Larsson • SWITZERLAND Zurich: Eva Mettler • SYRIA Aleppo: Hagop Topjian • THAILAND Bangkok: Alexander Ross. Samutprakarn: Thomas Estervog • UNITED KINGDOM Kent, Tenterden: Linda Anne Bateley. West Midlands, Birmingham: Anu D. Manchanda • UNITED STATES Arkansas, Greenbrier: Beverly A. Brannan. Arizona, Cave Creek: Nelson Crumling. California, Carlsbad: Martin Harmon, Brenda Harwick, Mark Johnson, Abba Steinfeld, Jim Viall, Lynn Viall, Philip York. Fremont: Ying Ying Chow. Pacifica: Diana L. Gamez. Rancho Cucamonga: Sandy MacLeane. San Jose: Wendy Bilodeau. Colorado, Alamosa: Michael Cavaliere. Delaware, Bridgeville: Thaïs Anne Lumpp-Lamkie. Florida, Clearwater: Tim Schuler. Hawaii, Haiku: Alison Fahland. Idaho, Twin Falls: Frederick House. Illinois, DuQuoin: William C. Duff. Maryland, Baltimore: Alissa Ann Leverock. Chevy Chase: Andrea R. Blake. Patuxent River: Pamela Stair. Maine, Newport: Cynthia Loreen Edwards. Massachusetts, Waban: Jane Prager. Michigan, Linden: Mary L. Mason. Paw Paw: Ellen Fillingham. Missouri, Perry: Bruce Elmer. Nevada, Las Vegas: Diane Flora. New Jersey, Cranbury: Edward Rosenzweig. Monmouth Beach: Michele Kelley. New York, New York: Lois Tamir. North Carolina, Kernersville: Jean Bonebreak. Ohio, Steubenville: Vincent A. Restifo. Rhode Island, Rumford: Sarah Horst. South Carolina, Sumter: James Markides. South Dakota, Piedmont: Randell Kenner. Tennessee, Knoxville: Lynn Shepard. Texas, Amherst: Joanne Hayworth. The Woodlands: Davena Liepman. Washington, Battle Ground: Joseph Bloyd. Bellingham: Mary L. Harding. Mill Creek: Nicki Taranto. Seattle: Janet Suzanne Holmes. Wisconsin, Beaver Dam: Thomas Wendt. Milwaukee: William Bailey • VIETNAM Ho Chi Minh City: Khoan Nhut Nguyen