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Demand was brisk at the 2018 AGTA show in Tucson.
Tucson 2018 Overview

An overview of the 2018 Tucson gem shows.

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Large sunstone rough from the Ponderosa mine in Oregon
Ponderosa Sunstone Update

John Woodmark provides an update on the Ponderosa sunstone mine in Oregon.

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Rough and faceted natural-color green diamonds.
Natural-Color Green Diamonds: A Beautiful Conundrum

Characterizes diamonds with exceptionally rare natural green color, based on GIA’s extensive database of samples.

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Rainbow hematite from Brazil’s Andrade mine.
Iridescence in Metamorphic “Rainbow” Hematite

Analyzes the substructures that cause the intense iridescence observed in “rainbow” hematite from Minas Gerais, Brazil.

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Namibian demantoid from the Green Dragon mine, preserved in host rock
Update on the Green Dragon Demantoid Mine in Namibia

Stephan Reif explains the mine-to-market approach at the largest continuously operating demantoid deposit.

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Red beryl from Utah found on the secondary 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.

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Paula Crevoshay’s “Yogo Columbine” sapphire pendant
The Role of Silicon in the Color of Gem Corundum

Considers the previously unreported but critical impact of silicon on the coloration of gem-quality sapphire.

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Flora and fauna brooches by Paula Crevoshay
Preview of Nature Art Science with Paula Crevoshay

Renowned designer Paula Crevoshay discusses artistic influences and her latest creations.

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Colored stone pendants designed by Erica Courtney
Designs from Erica Courtney

Award-winning jewelry designer Erica Courtney presents four of her creations.

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Indonesian opal cabochons, 6.94 and 3.79 ct.
Opal from West Java, Indonesia

Description of Indonesian opal reportedly from West Java.

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