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

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.

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

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

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

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

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

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.”

加利福尼亚州卡尔斯巴德 — 2021 年 1 月 21 日 — 注册参加 GIA 宝石知识周：春姿绽放。本次激动人心的虚拟活动为期四天，带您遨游有色宝石的美丽世界。

近日，GIA 纽约鉴定所有幸检验了一颗迷人的珍珠，它的故事更加引人入胜，快来一探究竟吧。

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.

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

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

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

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

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.