In recent decades, jadeite prices have risen dramatically. Driven by profit, a variety of imitations are found in the jadeite jewelry market.

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.

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.

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.

A master gem carver bases his latest design off a stunning stained glass window when attempting the world’s largest known cut kunzite.

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

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

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

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

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

Examines the effectiveness of hydrogen and oxygen isotopes in discriminating dolomite-related nephrites from the four most important occurrences worldwide.

A rough diamond crystal weighing 4.05 ct was observed with radiation staining on its surface.

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

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.

CARLSBAD, Calif. – Oct. 13 – As consumer interest in laboratory-grown diamonds increases, GIA (Gemological Institute of America) is driving its consumer-protection mission forward by introducing LGDR by GIA, a family of four new digital-only reports for laboratory-grown diamonds with 4Cs color and clarity specifications replacing the descriptive terms and grade ranges previously used on GIA reports for laboratory-grown diamonds.

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。