J. C. (Hanco) Zwaan, Jan Kanis, and Eckehard J. Petsch
Modern Diamond Cutting and Polishing
Gem Rhodochrosite from the Sweet Home Mine, Colorado
Kimberly Knox and Bryan K. Lees
Every issue also includes the most up-to-date reports from the GIA Laboratory (Lab Notes) and gemologists around the world (Gem News International).
GIA student and alumni save 10% on back issues! Enter coupon code GGALUM and a GIA Student Number at checkout.