CVD Laboratory-Grown Gem Diamonds from Plasmability
Quarterly Crystal: Fluorite in Quartz from China
Lepidolite in Copper-Bearing Tourmaline
CVD-Grown Diamond with an Unusual Blue Band
Checkered Pattern on Diamond
Assembled Bead Cultured Half-Pearl
Investigation in the Carlsbad laboratory reveals a pearl submission is not mabe as initially believed.
Wearable Art Jewelry Supporting Families in Guatemala
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.
Natural Non-Nacreous Pearls from Various Marine Mollusks
The Bangkok laboratory studies 35 loose non-nacreous pearls from a wide range of marine mollusk species.
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.
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.
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.
Phenomenal Gems
A look at the most popular phenomenal gems exhibited at the 2025 Tucson gem shows.
Update on Montana’s Rock Creek Sapphire
Rare Faceted Väyrynenite
Uniquely saturated examples of the collector stone were on display at GJX.
Paraíba Tourmaline Melee: An Entry-Level Market Perspective
Black Opal with Unique Play-of-Color
A black opal cabochon set in a ring displays vivid orange play-of-color.
G&G in a Flash: Glowing Gems - What Does Fluorescence Tell Us?
Learn about the principles, mechanisms, and characteristics of luminescence that create the impressive and memorable glow of gemstones.
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