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Dr. E. J. Gübelin Collection Peridot

Article

GIA's Gübelin Gem Project: Various Gems, Olivine - Rutile

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

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Dr. E. J. Gübelin Collection Kornerupine

Article

GIA's Gübelin Gem Project: Various Gems, Kornerupine - Natrolite

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

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Dr. E. J. Gübelin Collection Danburite

Article

GIA's Gübelin Gem Project: Various Gems, Danburite – Humite

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

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Gubelin Cordierite - Iolite 34802 300x169

Article

GIA's Gübelin Gem Project: Various Gems, Barite - Cuprite

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

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Dr. E. J. Gübelin Collection Apatite

Article

GIA's Gübelin Gem Project: Various Gems, Amblygonite - Axinite

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

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An Early Byzantine Engraved Almandine from the Garibpet Deposit, Telangana State, India: Evidence for Garnet Trade Along the Ancient Maritime Silk Road

H. Albert Gilg, Karl Schmetzer, and Ulrich Schüssler, August 6, 2018

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

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Figure 1. A silver brooch containing a large Slovak opal (77 ct, 34.5 × 25 × 13 mm) and 48 diamonds. The opal was initially purchased for Louis XVIII’s personal collection. In 1824, it adorned the clasp of Charles X’s coronation mantle, and around 1853 it was remounted onto this brooch for Empress Eugénie, which has been preserved. Photo by Peter Semrád; courtesy of the National Museum of Natural History in Paris (inventory no. MNHN 87.44).

Slovak Opal: A New Life for a Historical Gem

Peter Semrád, January 26, 2024

Reports on the recent production of precious and common opal from a centuries-old locality.

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Trapiche emerald slices from Colombia.

Trapiche Gems

Wim Vertriest, July 22, 2020

The unusual six-rayed trapiche pattern, identified mainly with Muzo emeralds, has also been discovered in Mogok sapphires and Mong Hsu rubies.

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Dr. E. J. Gübelin Collection Beryl

Article

GIA's Gübelin Gem Project:

Chemically pure beryl is colorless, but trace elements give rise to green, blue and pink/red colors.

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Emeralds from the Kafubu Area, Zambia

J. C. (Hanco) Zwaan, Antonín V. Seifert, June 1, 2005

Zambia is considered the world’s second most important source of emeralds by value (after Colombia).

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