Research Article Search Results
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.
Assembled Bead Cultured Half-Pearl
Investigation in the Carlsbad laboratory reveals a pearl submission is not mabe as initially believed.
Dendritic Patterns in Emerald
A partially filled fissure in an emerald exhibits patterns resembling natural foliage.
Rose-Shaped Cloud Inclusion in Diamond
A cluster of cloud inclusions in diamond forms a petal-like structure resembling a rose.
CVD Laboratory-Grown Gem Diamonds from Plasmability
A report from the New York laboratory on colorless and near-colorless CVD gem diamonds produced by the Texas-based company Plasmability.
CVD-Grown Diamond with an Unusual Blue Band
An HPHT-treated CVD-grown diamond displaying a blue growth band is examined in the Mumbai laboratory.
Checkered Pattern on Diamond
The Mumbai laboratory examines a modified pear portrait-cut natural diamond.
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.
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.
Applications of X-Ray Radiography and X-Ray Computed Microtomography in Gemology
X-ray imaging techniques revolutionized pearl testing by enabling gemologists to distinguish natural from cultured pearls through detailed visualization of their internal structures, evolving from film-based systems in the early 1900s to today’s sophisticated digital equipment.
Rare Musgravite Crystal in Green Sapphire
A surface-reaching crystal in a green sapphire is identified as musgravite.
“Out of the Darkness” …and Into the Light of Diamond Fluorescence
A unique art piece crafted with more than 9,200 diamonds is examined at GIA’s Carlsbad laboratory.
