James E. Shigley, Emmanuel Fritsch, Carol M. Stockton, John I. Koivula, C. W. Fryer, Robert E. Kane, David R. Hargett, and Clayton W. Welch
The History and Gemology of Queen Conch "Pearls"
Emmanuel Fritsch and Elise B. Misiorowski
The Seven Types of Yellow Sapphire and Their Stability to Light
Kurt Nassau and G. Kay Valente
Every issue also includes the most up-to-date reports from the GIA Laboratory (Lab Notes) and gemologists around the world (Gem News International).
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