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Figure 1. Left: Black beryl beads displaying six-rayed stars. Right: Black beryl beads displaying twelve-rayed stars. Photos by Tinh Xuan Nguyen.

Star Beryl

Tinh Xuan Nguyen, January 26, 2024

Black beryl beads display six-rayed and twelve-rayed stars.

Article

Fall 2023 G&G Available Now

Erica Zaidman, November 3, 2023

An overview of the Fall 2023 Gems & Gemology content.

Fire Obsidian’s Beguiling Spectrum

Robert Weldon and Nathan Renfro, August 4, 2023

A look at a rare volcanic glass from central Oregon with lapidary artist Tom Dodge.

Cause of Color in Yellow Sapphire, Plus Characterization of Oregon Sunstone, Ukrainian Beryl, and British Columbian Iolite

Duncan Pay, November 3, 2023

An overview of the Fall 2023 Gems & Gemology content.

Figure 1. Iridescent andradite samples (25 ct and 125 ct) from the Lindong area of Inner Mongolia, China. As shown in the left photo, sample G-1 displays iridescence on the (211) plane but not on the (110) plane. Photos by Jiuchang Yang.

A Newly Discovered Iridescent Andradite from Inner Mongolia, China

Jiuchang Yang, Quanli Chen, Fengshun Xu, Yan Li, and Xianyu Liu, November 3, 2023

The first report of iridescent andradite from China.

Figure 1. Faceted Oregon sunstone crystals (2.75–7.71 ct) representing the variety of colors observed. Photo by Adriana Robinson. Courtesy of the GIA Museum. Gifts of Western Ventures (pear shape), Dust Devil Mining Co. (oval), and John and Laura Ramsey (emerald cut on the far right).

Special Colors and Optical Effects of Oregon Sunstone: Absorption, Scattering, Pleochroism, and Color Zoning

Shiyun Jin, Aaron C. Palke, Nathan D. Renfro, and Ziyin Sun, November 3, 2023

Details the colors and optical effects caused by metallic copper inclusions in this gem-quality feldspar.

Burmese Star Peridot

Bear Williams and Cara Williams, July 22, 2020

A rare Burmese star peridot cabochon is characterized by a soft four-rayed asterism and extremely fine acicular inclusions.

A 4.77 ct near-round white Tridacninae pearl exhibited an attractive sheen-like flame structure in a pattern resembling an eye when viewed in certain directions under a single white light source. Photomicrograph by Ravenya Atchalak; field of view 7.20 mm.

An “Eye” on a Tridacninae Pearl

Ravenya Atchalak, August 4, 2023

A Tridacninae pearl exhibits a flame structure resembling an eye.

$This scene of an iron stain and numerous curved lines showing rainbow colors in a fracture resembles a scene from the night sky viewed through a telescope rather than a microscope. Photomicrograph by Charuwan Khowpong; field of view 2.85 mm.$

Night Sky in Yellow Sapphire

Charuwan Khowpong, August 4, 2023

Fiber-optic light creates a night sky scene in a yellow sapphire from Madagascar.

These iridescence features observed in a 1.71 ct natural diamond (top) were reminiscent of Rainbow Mountain in Peru (bottom). Photomicrograph by Tejas Jhaveri; field of view 2.90 mm. Bottom photo courtesy of Daniel Sánchez Ibarra (Wikimedia Commons).

Rainbow Mountain in Natural Diamond

Tejas Jhaveri and Sally Eaton-Magaña, August 4, 2023

An iridescent feather inclusion in natural diamond bears resemblance to Rainbow Mountain in Peru.

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