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

Four pearls submitted to the Bangkok lab proved to be natural non-nacreous specimens dyed pink, apparently to imitate true conch pearls.

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

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

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

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

Extensive analysis of early beads and pendants from archaeological sites in the French islands of the Lesser Antilles identified the objects as sudoite, which has never before been documented in any lapidary production.

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.

Documents Namak Mandi’s transformation from a salt market to one of Pakistan’s primary gem trading centers, with a look at the commercial activities taking place today.

Inspired fashioning showcases mobile inclusions in a polished quartz specimen, reminiscent of an hourglass.

The optical phenomenon of iridescence creates a beautiful pearly rainbow effect in an abalone shell.

Inclusions can be found in a variety of different gemstones; they create a window that allows the viewer to picture a stone’s formation history.

Raman analysis confirms that the yellow-orange to deep red inclusion in a faceted benitoite is indeed neptunite.

A clarity-enhanced rhodonite stuns with its exceptional size, transparency, and vivid color.

Natural opal beads displaying vibrant play-of-color are strung together to create a remarkable necklace.