3-hole punched. In this issue: Artificial Coloration of Diamonds by A. A. Schulke; Developments and Highlights at the Gem Trade Lab in New York by Robert Crowningshield; Developments and Highlights at the Gem Trade Lab in Los Angeles by Richard T. Liddicoat, Jr. ; The Spectrscopic Recognition of Natural Black Pearls by Robert Crowningshield. On the cover: a 60-carat Persian turquois blossom, with a diamond-set calyx, tops a flexible stem of baguette diamonds in a pin designed by Marc Kovan, of New York City. In black and white, old price stamped on front cover. ; 8vo 8" - 9" tall; 22594 View More...
