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.

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.

A CVD laboratory-grown diamond with a fraudulent GIA inscription is submitted to the Antwerp lab.

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

A beautiful melo pearl is accidentally served up for lunch within its host gastropod.

Phosphorescent-based screening initially results in a rare mixed-type natural diamond falsely testing as laboratory-grown.

Provides a visual guide to GIA’s approach to classifying and describing pearls.

Analyzes a group of 23 freshwater “Edison” pearls (a trade name referring to near-round freshwater cultured pearls, usually shell bead cultured) using various gemological and advanced instrumental techniques.

A rare transparent and near-colorless sodalite contains two-phase inclusions linking it to its ancient formation.

CARLSBAD, Calif. – Aug. 24, 2021 – Jade motifs often represent the ancient relationship between gems and humanity; they tell important stories and traditions. These stories come to life in a rare, spectacular set of books, The Bishop Collection: Investigations and Studies in Jade, recently acquired by GIA (Gemological Institute of America).