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Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine.

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Highly saturated green color defines high quality emerald.

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Beveled corners

Emerald cuts have concentric parallel rows of facets and beveled corners.

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“jardin,” or garden.

Eye visible inclusions create an internal scene referred to as “jardin,” or garden.

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Emerald crystals are commonly six-sided.

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The tops of emerald crystals are typically rather flat.

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Color direction

The best color is usually perpendicular to the top of the crystal.

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Figure 1. An unusually large cat’s-eye emerald weighing approximately 126 ct. Photo by Shunsuke Nagai.
An Extraordinarily Large Cat’s-Eye Emerald

The Tokyo laboratory examines a 126 ct cat’s-eye emerald from Brazil.

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This emerald displays the roiled growth structure similar to the <i>gota de aceite</i> effect.
Gota de Aceite–Like Effect in a Brazilian Emerald

GIA’s Tokyo laboratory examines a Brazilian emerald with a gota de aceite–like effect characteristic of Colombian emeralds.

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Eight round/oval emeralds (left) and four round emeralds (right) used in study.
A Gemological and Spectroscopic Study with Mobile Instruments of “Emeralds” from the Coronation Crown of Napoleon III

An examination of 45 gems from the coronation crown of Napoleon III, using nondestructive mobile spectroscopic and gemological testing methods.

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Swat Valley emeralds are known for their intense vivid green color.
Myne London: Sourcing Emeralds with a Mission

A London-based company aims to responsibly source emeralds from Swat Valley, Pakistan, while supporting women in business and education.

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Cluster of bamboo-shaped apatite crystals in a Zambian emerald.
Apatite Cluster in Zambian Emerald

A fantastic example of an apatite inclusion cluster in emerald consisting of a hexagonal prismatic crystal and many rod- and bamboo-shaped crystals.

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The fracture filling material displayed a visually interesting pattern in this emerald.
Fracture-Filled Emerald with Mysterious Filler Patterns

Filler patterns resembling a labyrinth are observed in emerald fractures.

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The Madonna emerald
History of Emerald Mining in the Habachtal Deposit of Austria, Part II

The finale of a two-part series on the mining history of Austrian emerald deposits in the Habachtal region.

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A clarity-enhanced emerald showed repair work.
Unusual Repair of a Natural Emerald

Glass identified as the raw material used to conceal damage of a natural emerald.

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A 1.86 ct pear-shaped Russian emerald.
Nail-Head Spicule in a Russian Emerald

The Carlsbad laboratory observes a nail-head spicule in a natural Russian emerald.

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Emerald crystals from Habachtal
History of Emerald Mining in the Habachtal Deposit of Austria, Part I

Contributes to the mining history of Austria’s Habachtal region, which is believed to be one of the earliest emerald deposits.

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