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.

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.

Reports on the geology, background, and current state of mining and production at Iran’s largest turquoise mine.

Figure 1. The vivid colors seen in fine gem-quality spinel are derived from the mixing between multiple different chromophores in a range of ratios and concentrations, as in this fine 13.52 ct violetish purple spinel. Courtesy of the Dr. Edward J. Gübelin Collection. Photo by Robert Weldon/GIA.

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.

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.

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.

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

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.

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