Colored Stones and Pearls
Poster abstracts on “Colored Stones and Pearls” from GIA’s 2018 International Gemological Symposium.
Poster abstracts on “Gem Characterization” from GIA’s 2018 International Gemological Symposium.
New Technologies and Techniques
Poster abstracts on “New Technologies and Techniques” from GIA’s 2018 International Gemological Symposium.
Big Sky Country Sapphire: Visiting Montana’s Alluvial Deposits
Documents a visit to the upper Missouri River and Rock Creek sapphire mining areas.
Characterization of Mg and Fe Contents in Nephrite Using Raman Spectroscopy
Evaluates the usefulness of Raman spectroscopy in distinguishing the color varieties of nephrite based on the relative ratio of Mg to Fe concentration.
Optimizing Face-Up Appearance in Colored Gemstone Faceting
How contrast patterns can increase perceived brightness and optimize a gemstone's appearance.
Famous Diamonds Examined by GIA
An aura of mystery has always surrounded these natural wonders, so it was quite an honor when GIA researchers examined these famous diamonds.
Cultured Pearl Update
Fran Mastoloni shares his thoughts on the status of the cultured pearl market.
Finds from the Secondary Market
Dave Bindra shows some noteworthy pieces he obtained on the secondary market and shares his thoughts on the state of the colored stones market.
Gem Virtuosos: The Drehers and Their Extraordinary Carvings
A look at the artistic heritage of the Drehers, an influential family of gem carvers in Idar-Oberstein, Germany.