Gemstones formed in metamorphic environments offer insights into the earth’s history and the evolution of tectonic activity that led to their formation.

Microscopic observation unveils the first known instance of skeletal metallic inclusions in Brazilian Paraíba tourmaline.

GIA president and CEO Susan Jacques receives the American Gem Society’s highest honor.

The Nineteenth Annual Sinkankas symposium, held at GIA’s Carlsbad, California campus, focused on gems and minerals of San Diego County.

An intriguing metallic inclusion is observed in a faceted garnet.

The quality and size of this 4.04 ct CVD-grown diamond ring demonstrate the advancing technology in laboratory-grown diamonds.

A look at Virtu Gem, a company dedicated to improving artisanal mining practices in Africa.

Examination of a gem-quality aquamarine crystal reveals an inclusion cluster presumed to be columbite.

Examines the mining history and geological characteristics of the three secondary sapphire deposits in the state of Montana, as well as the properties of these sapphires (unheated and heat-treated).

GIA’s Mumbai laboratory reports on pearl samples from a culturing experiment by the Suwaidi Pearl Farm in the UAE.

An overview of the 2023 Tucson gem shows.

A partially exposed orange garnet inclusion with surrounding fractures resembles a flying insect in a brownish yellow diamond.

A rare example of pink pyrope garnet is examined in the Carlsbad laboratory.

Four atypical bead cultured pearls with variations on two types of nuclei are examined in the Mumbai laboratory.

Evaluates the growth mechanisms of special morphological features in Colombian emerald, including possible relationships to trapiche emeralds and samples displaying the gota de aceite effect.

Microscopic examination of a ruby at the Carlsbad laboratory reveals synthetic overgrowth indicative of high-temperature heat treatment.

A look at the largest CVD diamond GIA has encountered to date.

GIA researchers report on a new nickel-diffusion treatment used to modify color in spinel and present criteria for identification.

The Carlsbad laboratory reports on a Fancy Deep brownish yellowish orange diamond featuring trigons within subsurface etch channels.

Examines the use of strong fluorescence near 394 nm under 320 nm excitation as a potential means of identifying copper diffusion treatment of feldspar.