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Internal twin bead structures correspond to a shape like a dumbbell or peanut shell.
Freshwater Bead-Cultured Pearls with Multiple Features of Interest

GIA’s Hong Kong laboratory examines a freshwater bead-cultured pearl necklace possessing several interesting features.

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Sapphire shows a strong color change from grayish violet to purple-pink.
Low-Fe, High-V Color-Change Burmese Sapphire

The Carlsbad lab identifies a color-change Burmese sapphire with a unique chemistry profile.

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Five zircon samples studied for radioactive degradation of crystal structure.
Chemical Analysis of Zircon

Trace-element analysis is used to identify metamictization, treatment, and growth conditions of zircon.

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Short-wave UV exposure’s effect on zircon color
Tenebrescent Zircon

Color modification is observed in a reddish orange zircon at the Bangkok laboratory.

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Melt inclusions in the 1.70 ct ruby from Montana
A Rare Ruby from Montana

An exceptional ruby specimen is identified with a Montana of origin in the Carlsbad lab.

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Three freshwater pearls attached to their host shells
Freshwater Pearls, Blister and Loose, with Their Host Shells

Three freshwater pearls, two blister and one loose, were examined in the New York lab.

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Brazilian tourmaline displays a sharp cat’s-eye
Cat’s-Eye Brazilian Paraíba Tourmaline

Chatoyant vivid blue Brazilian tourmaline examined in the Bangkok lab.

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CVD-grown diamond with an internal inscription of the Lightbox logo
Gemological Analysis of Lightbox CVD-Grown “White” Diamonds

The Carlsbad lab provides a gemological analysis of two Lightbox CVD laboratory-grown near-colorless diamonds.

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The 14.06 ct blue Kashmir sapphire featuring pargasite inclusions
Large Pargasite Inclusion in Kashmir Sapphire

Unusually large prismatic pargasite inclusions observed in a Kashmir sapphire submitted to the Carlsbad lab for origin determination.

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Natural diamond originally submitted as a synthetic
Natural Diamond Mistaken as HPHT Synthetic

Declared synthetic diamond identified as natural in the Carlsbad lab.

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