Magnetite inclusions in a four-rayed star peridot help to date its terrestrial age.

GIA Johannesburg identifies fraudulent GIA inscriptions on several synthetic moissanites submitted as diamonds.

A 60.71 ct cabochon was recently submitted to the Tokyo lab for identification.

A large natural pearl discovered in an edible oyster offers insight to the scientific pearl community.

Dramatic color-fluorescing areas in a sword-shaped diamond give rise to the nickname “Fire and Ice.”

Reports on a visit to a shell nucleus manufacturer and two pearl farms in northern Vietnam, which is emerging as a notable producer.

The Carlsbad laboratory received for examination two dark-colored bead cultured pearls embedded with an electronic device from Jeremy Shepherd, CEO of Pearl Paradise.

An emerald from the Swat Valley manifests its growth in three distinct steps, identifying it as “trapiche-type.”

CARLSBAD, Calif. – Jan. 21, 2021 – Register for GIA’s Knowledge Rocks Week: Spring Into Color for four days of exciting virtual events taking you deep into the beautiful world of colored stones.

ニューヨークのGIAラボラトリーは先日、素晴らしい真珠を検査する機会を得て、さらに素敵な話も聞くことができました。

Annotated reading lists compiled on Lazurite (Lapis Lazuli) from Afghanistan and its Artistic Use as a Blue Pigment (Ultramarine)

An overview of the Summer 2020 Gems & Gemology content.

Whimsical windmill-like inclusions are found in a high-quality orange specimen of the rare mineral sphalerite.

Lotus Gemology in Bangkok received a large parcel of dark red spinels for identification.

Mineral and fluid phases within negative crystals in metamorphic sapphires provide us with general information on the sapphire and the trapped fluid itself.

Rubies from Mozambique, which were examined at the Lotus Gemology lab in Bangkok, proved to be infilled with böhmite, a secondary mineral in corundum.

Researchers from De Beers Group Technology present a technique that expands on the surface luminescence used in the DiamondView instrument to provide additional imaging information and quickly distinguish colorless or near-colorless natural diamond from laboratory-grown diamond.

Presents a study that suggests optically brightened pearls can be consistently separated from non-brightened pearls using fluorescence spectroscopy.

Presents the four major groups of defects responsible for the color in nearly all yellow and orange diamonds.

Many legends are told about the history of the Chivor emerald mine.