Books: In Praise of Hands: The Art of Fine Jewelry at Van Cleef & Arpels
Review of Franco Cologni’s In Praise of Hands: The Art of Fine Jewelry at Van Cleef & Arpels
Three-Phase Inclusions in Emerald and Their Impact on Origin Determination
Discusses the role of three-phase inclusions in emerald, in combination with spectroscopy and trace-element analysis, in determining geographic origin.
Botswana’s Scintillating Moment
Examines the history of diamond production in Botswana and the long-term outlook for beneficiation through value-added industries.
Shell Pearl as a Pearl Imitation
Examination of commercially-available "shell pearls" reveals imitation material.
GIA Museum Exhibits in New York
A brief look at GIA's permanent museum exhibit at the New York lab and campus.
Color Phenomena of Blue Amber
Investigates the presence of fluorescence, rather than iridescence, as the cause of color in blue amber from the Dominican Republic and Indonesia.
Experimental Studies on the Heat Treatment of Baltic Amber
Amber samples were heat-treated, using various procedures and parameters, in an effort to reproduce materials found in the jewelry market.
Chameleon Diamond with Nickel Absorption Band
A rare chameleon diamond is examined in GIA's Carlsbad lab.
Yellow CVD Synthetic Diamond
A Fancy yellow type Ib CVD-grown synthetic diamond undergoes testing at the New York lab.
Using Conventional Equipment to Separate Natural from Synthetic Ametrine
A summary of the article “A simple approach to separate natural from synthetic ametrine,” by Francine Payette.