Non-Nacreous Purple and White Pearls Reportedly from Spondylus Species
Examination of pearls with a dominant purple hue, reportedly from the Spondylus calcifer mollusc.
Fluorite Sphere with Phosphorescent Coating
A sphere with unusual phosphorescence is seen in the Carlsbad laboratory.
Three Unique Large Natural Pearls from Haliotis (Abalone) Species
Abalone pearls submitted to the New York lab provide insight into the range of colours and shapes this type of mollusc can produce.
Spring 2015 G&G Examines Blue Spinel, Chinese Jewellery Design and the Latest in Synthetics
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)
A rare look at natural pearls from a known Spondylus species, commonly called “thorny” oysters.
Natural Pearl Aggregates from Pteria Molluscs
Ten loose pearls with interesting shapes and internal growth features were from Pteria-species molluscs.
Assembled “Pearl” Filled with Wire
Microradiography reveals wire fillings within a “pearl” created from two separate specimens.
Spring 1991 G&G Lab Notes
This section, from the Spring 1991 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.