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

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.

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.

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.

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

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).

CARLSBAD, Calif. – Aug. 19, 2021 – The Gianmaria Buccellati Foundation Award for Excellence in Jewelry Design is usually announced early in the year amid the glorious colors of the Tucson gem shows.