HPHT-Grown Colorless Diamond Displaying Unusual Phosphorescence Effects
Study of phosphorescence produced from visible light suggests future difficulty in accurately assessing bodycolor of HPHT-grown diamonds.
Color Study of Fancy Sapphire from Greenland
The Bangkok laboratory identifies the chromophores responsible for the fancy colors observed in treated sapphire from Aappaluttoq, Greenland.
Bright Orange Sapphire from Greenland
A transparent bright orange sapphire from Greenland stands out at the AGTA show in Tucson.
New Violet Orbicular Chalcedony from Ethiopia
Tumble-polished freeforms of violet chalcedony with orb-like structures from a new find in Ethiopia were on display at GJX.
GIA Museum’s “Paint the Town Ruby Red” Exhibit at TGMS
The GIA Museum’s exhibit at TGMS spotlights a Burmese ruby necklace to illustrate the role of chromium in fluorescence.
Grayish Blue CVD Diamond Colored by GR1 and SiV–
Examination of a grayish blue CVD laboratory-grown diamond indicates its color was caused by both the GR1 and SiV– centers.
Sweet Home Mine Rhodochrosite from 1888
A rhodochrosite on display at AGTA dates back more than a century to Colorado’s Alma Mining District.
Cultured Pearl Market Update
A look at the latest cultured pearl trends and market updates from dealers at the AGTA show.
“Edison” Pearls: Increasing Market Presence
The increased popularity of “Edison” pearls was evident at the AGTA and GJX shows, with more colors and larger sizes available.
GIA Library Wins Exhibit Award at TGMS
GIA’s Richard T. Liddicoat Gemological Library and Information Center wins award for exhibit highlighting mercury-free gold mining at TGMS.
Vibrant Green Grossular Garnet “Transvaal Jade”
Grossular-andradite garnet stands out at the Pueblo show with a beautiful vibrant green color and high-polish luster.
Heated Purplish Pink Sapphire from Ilakaka (Madagascar) with Colored Monazite Inclusions
Orange-brown monazite inclusions in a purplish pink sapphire are analyzed for evidence of heat treatment.
Italian Precious Coral
A look at the Italian coral market and precious coral samples from the Mediterranean Sea.
Misfit Diamonds: Beauty in the Imperfect
Unusual diamonds with eye-visible inclusions are gaining popularity in the market.
Sean Hill: Exquisite Jewelry Designs
Former university professor Sean Hill shares some of his unique jewelry designs at the GJX show.
Synthetic Color-Change Wakefieldite
A report on the striking color-change behavior of the first faceted synthetic wakefieldite seen at GIA.
Bead Cultured Abalone Pearls from Chile
A study of abalone bead cultured pearls from a new pearl culturing technique tested in Chile.
Chromophore Behaviors (Including the 880 nm Absorption Band) in an Irradiated Pink Sapphire
A report showing the preliminary results of a radiation experiment with pink sapphire from Madagascar.
Spotlight on Natural Nacreous Pearls
Alex Vock shares his expertise on natural saltwater nacreous pearls.
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