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

Lee Downey, owner of Artifactual (Tucson, Arizona), spoke with us in early 2020 about his 35 years in the fossil ivory carving trade and the impact of ivory bans on his business.

There’s only one place on earth where the general public can prospect for diamonds directly from a primary kimberlite pipe: Crater of Diamonds State Park.

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

Diaspore, an orthorhombic aluminum oxide hydroxide mineral with the formula AlO(OH), is a relative newcomer to the jewelry scene, with some stones possessing a captivating ability to change color between pale green, yellow, pink, and purple when viewed in different sources of light.

Gem silica, also known as “chrysocolla chalcedony,” is considered the most valuable variety of chalcedony.

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

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.

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.

Scientists in Russia construct an origin story through the analysis of petrified wood popularly used in the souvenir trade.

非開示のラボラトリー グロウンおよび類似石のファンシー メレーが天然ファンシー メレーに混在していることに対する業界の懸念にGIAがどのように対処しているかについて学びましょう。