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.

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

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

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

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

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.”

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

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

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.”

Examination of a large black star sapphire reveals filling with both glass and dopping varnish.

Epigenetic residue in rock crystal quartz creates a novelty inclusion with the appearance of a fried egg.

An overview of the Fall 2020 Gems & Gemology content.

Testing of a Mogok spinel demonstrates that oil can have a significant impact on clarity.

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。

Eaton-Magaña S., Breeding C.M., Palke A.C., Homkrajae A., Sun Z.Y., McElhenny G. (2021) Raman and photoluminescence mapping of gem materials. Minerals, Vol. 11, No. 2, Art. 177.

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。

Smith E.M., Nestola F., Pasqualetto L., Zorzi F., Seccon L., Wang W. (2021) The new mineral crowningshieldite: A high-temperature NiS polymorph found in a type IIa diamond from the Letseng mine, Lesotho. American Mineralogist, Vol. 106, No. 2, pp. 301-309.