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A 24.96 ct sphene from Zimbabwe (left) and sillimanites from Sri Lanka and Myanmar (right)
Vibrantly Colored Gems

Bill Larson of Pala International reports a very strong AGTA Tucson show.

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Pearls, shells, and jewelry on table
Article
The Lure of American Freshwater Pearls: Revisiting the Latendresse Family

John Latendresse is known as the father of American cultured pearls. He was also a great natural pearl collector and left his family a remarkable natural pearl collection. The Latendresse family is well recognized in the American pearl industry and has long supported GIA pearl research. Come with us to revisit this family and their pearl collection.

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Article
Leaf Motifs: Timeless Beauty for All Seasons of Jewelry

The humble leaf has captivated jewelry designers for centuries and they’ve transformed it enduring pieces of beautiful jewelry.

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Identification of Yellow Cultured Pearls from the Black-Lipped Oyster Pinctada Margaritifera

Although the Pinctada margaritifera oyster usually is associated with the black pearls cultured in French Polynesia, it also can produce attractive large yellow cultured pearls.

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Article
Summer 2015 G&G: Dual-Stars, Photomicrography Guide, Rubies from Tajikistan, New Micro-World Section

G&G Brief presents an overview of the content of the Summer 2015 issue of Gems & Gemology.

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Article
Spring 2015 G&G Examines Blue Spinel, Chinese Jewelry Design and the Latest in Synthetics

G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.

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Cultured Pearls from the Gulf of California, Mexico

Black pearls have been found in Mexico’s Gulf of California since the area was settled more than 2,000 years ago.

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Update on the Identification of Treated “Golden” South Sea Cultured Pearls

This study demonstrates how atypical absorption features, particularly in the blue region of the spectrum, can be used to positively identify color treatment.

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Spectral Reflectance and Fluorescence Characteristics of Natural-Color and Heat-Treated “Golden” South Sea Cultured Pearls

A comparison study was made between the yellow and white nacre of the gold-lipped Pinctada maxima oyster shell and 65 yellow cultured pearls.

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Confusing, Triangular Inclusions in an Art Deco-Style Pin
Spring 1991 G&G Lab Notes

This section, from the Spring 1991 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.

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