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Non-Nacreous Purple and White Pearls Reportedly from Spondylus Species

Artitaya Homkrajae, November 7, 2016

Examination of pearls with a dominant purple hue, reportedly from the Spondylus calcifer mollusc.

Fluorite Sphere with Phosphorescent Coating

Nathan Renfro, July 31, 2015

A sphere with unusual phosphorescence is seen in the Carlsbad laboratory.

Three Unique Large Natural Pearls from Haliotis (Abalone) Species

Joyce Wing Yan Ho and Surjit Dillon Wong, November 23, 2015

Abalone pearls submitted to the New York lab provide insight into the range of colours and shapes this type of mollusc can produce.

Article

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

Russell Shor, June 12, 2015

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

Natural Pearls Reportedly from a Spondylus Species (“Thorny” Oyster)

Joyce WingYan Ho and Chunhui Zhou, October 31, 2014

A rare look at natural pearls from a known Spondylus species, commonly called “thorny” oysters.

Natural Pearl Aggregates from Pteria Molluscs

Sally Chan and Yixin (Jessie) Zhou, January 30, 2015

Ten loose pearls with interesting shapes and internal growth features were from Pteria-species molluscs.

Assembled “Pearl” Filled with Wire

Nanthaporn Somsa-ard and Areeya Manustrong, April 30, 2014

Microradiography reveals wire fillings within a “pearl” created from two separate specimens.

Spring 1991 G&G Lab Notes

March 1, 1991

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