Examines a very large dataset of colorless to near-colorless diamonds submitted to GIA and evaluates their diamond type and spectroscopic properties.

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

“Star cruisers” formed of ferrocolumbite seem to fly in a large topaz crystal from the Shigar Valley in Pakistan.

Presents spectroscopic and chemical analysis of a new variety of turquoise with a rare raindrop pattern with saturated colors.

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.

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

Presents a detailed study of gemological properties, inclusion features, spectroscopic characteristics, and chemical composition of emeralds from this important source.

Chronicles important auctions of jewels from European royal collections over the years, with a focus on a recent high-profile sale of items that once belonged to Marie Antoinette.

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)

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

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

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

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

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

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

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

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

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.