An overview of the Fall 2021 Gems & Gemology content.

Several shells received at the Hong Kong laboratory were identified as fossils replaced by emerald crystals.

A study on heat with pressure treatment of blue sapphires reveals FTIR patterns associated with different iron concentrations.

Fura Gems hosted its first sales event for rough Mozambican rubies in August and September 2021.

This study examines FTIR spectra of yellow sapphire heat treated in an oxidizing atmosphere to deepen its color.

A fixed star indicating manufactured asterism helps to identify an imitation star sapphire.

Recently, a 23.67 ct pear cabochon aquamarine with light greenish blue color and poor clarity was sent to the Taiwan Union Lab of Gem Research (TULAB) for identification.

Careful comparison of two GIA reports reveals a fraudulent inscription on a laboratory-produced diamond presented as a natural.

Accidental laser damage likely caused unusual internal spiral markings in a 2.44 ct CVD-grown diamond.

The Carlsbad laboratory recently had the chance to examine a 4.60 ct cushion-cut zircon with truly unusual color behavior.

Creative faceting highlights an octahedral-shaped cloud inclusion in a 2.01 ct diamond octahedron.

A group of large, high-quality CVD material demonstrates the continued challenge of identifying laboratory-grown gems.

The Tokyo lab examined a stunning double cat’s-eye emerald whose chatoyancy was created both by its cut and its inclusions.

A colorless topaz from Nigeria hosts the only known example of willemite as an inclusion in topaz.

Although spinel is rarely treated, there have been some heated spinels available in the trade.

Distinguished research fellow Dr. James Shigley receives the Robert M. Shipley Award for his contribution to the science of gemology.

加利福尼亚州卡尔斯巴德 – 2021 年 11 月 9 日 – GIA团体 - 全球有 3,300 多名从业员和数十万毕业生—向本周初去世的行业代表人物Helene Fortunoff 的家人表示哀悼。

CARLSBAD, Calif. – Sept. 13, 2021 – In mid-August, as reported in the media, police in Surat, India, uncovered a fraudulent scheme involving counterfeit inscriptions linking lower-quality diamonds to GIA diamond grading reports for higher-quality stones.

Using customized, image-based measurement systems to quantify the effect of fluorescence on the color, brightness, and transparency of gem diamonds viewed in both face-up and table-down orientations.

An overview of the Summer 2021 Gems & Gemology content.