Lab Notes
Gems & Gemology, Fall 2017, Vol. 53, No. 3

Emerald with Mobile Inclusion

Nicole Ahline
Rough emerald with mobile inclusion.
This 9.02 g rough emerald contains a prominent eye-visible mobile inclusion. Photo by
Robison McMurtry.

Multiphase inclusions are key indicators when identifying emeralds and determining their origin. Gemologists look for the jagged three-phase inclusions in stones of Colombian origin or blocky two-phase inclusions in Brazilian or Zambian emerald. These multi­phase inclusions typically require higher magnification and considerable maneuvering of the emerald to get a precise view. 

Recently, the Carlsbad laboratory received a 9.02 g rough emerald from Lucas Fassari (Costa Mesa, California). The rough had an eye-visible mobile inclusion (see above) consisting of a CO2 gas bubble and salt crystals suspended in a fluid. The emerald was identified using a handheld spectroscope and optical properties. It was determined to be of Colombian origin by its jagged three-phase inclusions and crystals that had characteristics of pyrite and calcite. The mobile inclusion was quite large in relation to the rough emerald, which measured 28.76 × 14.82 × 12.83 mm, including its calcite and shale matrix. The CO2 bubble measured approximately 4 × 3 mm. 

Mobile inclusions of this size are captivating to observe, and to see one in an emerald adds more allure to the piece. Cutting this specimen into a faceted gemstone would lose what makes this rough emerald unique.

Download this issue

Fall 2017 Gems & Gemology Click here for
the Fall 2017 G&G

Learn More About Emerald

Why We Love
Explore emerald history, research, quality factors, and more in the GIA Gem Encyclopedia.
 
Read More

Mobile inclusion bubble in Emerald

Mobile Inclusion in Emerald Rough

Richard T. Liddicoat Gemological Library

Search GIA's library catalog of 57,000 books, 1,800 videos, 700 periodicals, and the renowned Cartier Rare Book Repository and Archive.
 
Visit the GIA Library

You Might Also Like

Find a Retailer
learn more
Shop the Campus Store
Learn More
Quality Assurance Benchmarks
Learn More
Gems & Gemology
G&G Winter 2017 Edition
Learn more