Emeralds in Catherine de’ Medici’s Pendant: An Unexpected Geographic Origin
Archival research and gemological characterization reveal the geographic origin of two emeralds set in a pendant linked to Catherine de’ Medici, Queen of France from 1547 to 1559.
A Study of the Winston Red: The Smithsonian’s New Fancy Red Diamond
Presents the first scientific and historical study conducted on the 2.33 ct Winston Red, the fifth-largest known Fancy red diamond in existence.
The 3309 cm–1 Series in Sapphire and Ruby: A Focus on FTIR Peak Position Variation
Investigates the correlations between peak positions in the 3309 cm–1 series with trace element concentrations for ruby, metamorphic and basalt-related blue sapphire, and laboratory-grown sapphire.
Quarterly Crystal: Fluorite in Quartz from China
Lepidolite in Copper-Bearing Tourmaline
Kyanite in Quartz
“Hummingbird” in Orangy Yellow Diamond
Evil Eye in a Flux-Healed Mong Hsu Ruby
Devitrified Glass “Pom-Poms” in Ruby
Dendritic Patterns in Emerald
Copper in Indonesian Chalcedony
Enormous South Sea Cultured Pearl with Filled and Partially Hollow Structure
Examination of a gigantic South Sea bead cultured pearl reveals an intriguing internal structure.
Aquamarine with Fluorite Inclusions
Rock Crystal Quartz Skull
Rose-Shaped Cloud Inclusion in Diamond
CVD Laboratory-Grown Gem Diamonds from Plasmability
Fancy Vivid Yellow HPHT-Grown Diamonds
Irreversible Photochromism in Synthetic Sapphire
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