The Grand Sapphire of Louis XIV and The Ruspoli Sapphire: Historical and Gemological Discoveries
Archival research and gemological characterization reveal the true story of this 135.74 ct blue sapphire from the French crown jewels.
Exhibition Review: Glitterati: Portraits and Jewelry from Colonial Latin America
Review of Glitterati: Portraits and Jewelry from Colonial Latin America at the Denver Museum of Art.
Vanadium and Chromium-Bearing Pink Pyrope Garnet: Characterization and Quantitative Colorimetric Analysis
This type of pink pyrope garnet, believed to have been mined in Tanzania, shows a distinct color-change phenomenon resulting from its unique chemical composition.
Book Review: Towards an Art History of Medieval Rings: A Private Collection
Review of Towards an Art History of Medieval Rings: A Private Collection, by Sandra Hindman, with Ilaria Fatone and Angelique Laurent-di Mantova.
Very Large Type Ib Natural Diamond
A 13.09 ct. Fancy yellow rough diamond, with C centers causing the intense color, is seen in the New York lab.
Rubies from a New Deposit in Zahamena National Park, Madagascar
A field expedition from GIA Bangkok explores a new ruby deposit and collects specimens for study.
Book Review: Collector’s Guide to Herkimer Diamonds
Review of Collector’s Guide to Herkimer Diamonds, by Michael R. Walter.
Letters: Trapiche Nomenclature
A response to the Fall 2015 G&G article on trapiche emerald from Colombia.
Two Large CVD-Grown Synthetic Diamonds Tested by GIA
Two near-colorless rounds, weighing 3.23 and 2.51 ct, were the largest CVD-grown synthetic diamonds GIA has examined.
GSA 2015 Annual Meeting
A report summarizing the annual meeting of the Geological Society of America in Baltimore.