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Suite containing over 36 carats of Yogo sapphire
Gemological Characterization of Sapphires from Yogo Gulch, Montana

A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.

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Horn shaped jewel pendant featuring emeralds, rubies, diamonds and pearls, and shows engravings in Arabic.
Article
Centuries of Opulence: Jewels of India

Learn about the journey of gemstones used to create the fabulous Indian jewelry featured in this special exhibit at GIA in Carlsbad.

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Kasumigaura pearl necklace and recently harvested nucleated pearls
Cultured Pearls from Lake Kasumigaura: Production and Gemological Characteristics

Examines Japanese “Kasumiga” freshwater cultured pearls, which grow in a variety of colors.

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Timeline showing the use of garnets in different eras from 300 BCE to 700 CE
An Early Byzantine Engraved Almandine from the Garibpet Deposit, Telangana State, India: Evidence for Garnet Trade Along the Ancient Maritime Silk Road

Analyzes the chemical composition and inclusion characteristics of this ancient artifact.

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Article
Diamond Fun Facts

Learn more about one of the Earth’s most fascinating creations, including some that became the most famous.

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Nephrite Jade from Val Malenco, Italy: Review and Update

Analysis of 21 rough and gem-quality samples offers an update on the composition and properties of this pale green gem from the Italian Alps.

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Man in a hard hat sits in an underground emerald mine.
Article
Geologist’s Newest Mission: Share the Love of Colored Gemstones

African-born colored stone specialist visits America and changes his life forever; finding love, earning GG and starting a new career.

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Recent production of turquoise from Polk County, Arkansas
Turquoise from Western Arkansas

A report on turquoise from the only known U.S. deposit outside of the Southwest.

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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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Experimental steps of DNA extraction and purification.
DNA Techniques Applied to the Identification of Pinctada Fucata Pearls from Uwajima, Ehime Prefecture, Japan

Shows how genetic material extracted from small amounts of pearl powder can be a useful indicator of this akoya cultured pearl species.

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