Research Article Search Results

Nacreous pearls are known to have platelet growth resembling fingerprints or topographic maps, but a less common appearance is nacre with a concentric spiral pattern.

The Tokyo lab recently identified a unique localized distribution of cloud-like inclusions in a chrysoberyl.

Remarkable “horsetail” inclusions discovered in a demantoid garnet, while their origin and composition remain under discussion.

The Carlsbad lab received a rhodochrosite cabochon featuring rhomboid-shaped fluid inclusions, causing a four-rayed star.

Contributes to the mining history of Austria’s Habachtal region, which is believed to be one of the earliest emerald deposits.

Unique diamond- and emerald-lensed spectacles from the Mughal Empire were tested in GIA’s New York laboratory.

Researchers examine six specimens of banded turquoise, obtained through long-term cooperation of local miners in Zhushan County.

The first installment of this column discusses the formation of colored stones from the crust-mantle transition and below.

Examines the mining and the internal, spectroscopic, and chemical features of peridot from this deposit, which possesses a rich olive green color and is available in large sizes.

One of the more subtle inclusion scenes gemologists sometimes observe in natural diamonds is the presence of crystallographically oriented structural defects known as “internal graining.”

A gemological analysis of blue Burmese sapphires from Mogok, based on a series of field expeditions over the last decade.

An overview of the Winter 2021 Gems & Gemology content.