Non-Nacreous Purple and White Pearls Reportedly from Spondylus Species
Examination of pearls with a dominant purple hue, reportedly from the Spondylus calcifer mollusc.
Strong Pinkish Purple Freshwater Bead-Cultured Pearls
A necklace of Chinese freshwater bead-cultured pearls demonstrates the strides made in culturing techniques.
Fluorite Sphere with Phosphorescent Coating
A sphere with unusual phosphorescence is seen in the Carlsbad laboratory.
Partially Hollow Tridacna Blister Pearls with Shells Attached
Blister pearls attached to shells are seen in both the Bangkok and the New York laboratories.
Large Natural Fossil Blister Pearls from Tridacna (Giant Clam) Species
Two blister pearls attached to a host shell believed to have fossilised during the later Pleistocene period and discovered in south-eastern Kenya are studied.
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.
Natural Conch “Rosebud” Pearls
Unique natural conch pearls are studied in the New York lab.
Winter 2011 G&G Lab Notes
This section, from the Winter 2011 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.
Fall 2011 G&G Lab Notes
This section, from the Fall 2011 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.
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.