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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.

A subsurface feather in diamond resembling an insect wing, with visible iridescence caused by thin-film interference. Photomicrograph by Matthew Hardman; field of view 2.90 mm.

An Iridescent “Insect Wing” in Diamond

Mei Yan Lai and Matthew Hardman, August 4, 2023

A feather inclusion with iridescence caused by thin-film interference in diamond resembles an insect wing.

Figure 1. A 13.37 ct grayish blue aquamarine displaying asterism. Photo by Towfiq Ahmed.

Star Aquamarine

Jessa Rizzo, August 4, 2023

A look at a very rare instance of a six-rayed star in aquamarine.

Article

Summer 2023 G&G Available Now

Erica Zaidman, August 4, 2023

An overview of the Summer 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.

Iridescence in iris quartz from Jalgaon, India

Causes of Iridescence in Natural Quartz

Xiayang Lin and Peter J. Heaney, May 8, 2017

Describes the occurrence of iridescence, and the role of differential etching, in quartz crystals from India’s Jalgaon District.

Figure 1. A 155 g aquamarine crystal containing a liquid and gas bubble inclusion. The crystal measures 11.9 cm long and the inclusion 4.3 cm long. Photo by Robert Weldon; courtesy of Kreis Jewellery GmbH.

Exceptional Gemstone Acquisitions by the Kreis Family

Erin Hogarth, May 23, 2023

Stefan and Alexander Kreis share three impressive gemstone acquisitions at GJX in Tucson.

Figure 1. Left: A 586.43 ct cat’s-eye aquamarine donated by Gary Bowersox and Kathleen Kolt-Bowersox to the Smithsonian National Museum of Natural History gem collection. Photo by Robert Weldon; courtesy of the Smithsonian National Museum of Natural History. Right: Dr. Jeffrey Post (left) and Gary Bowersox with the cat’s-eye aquamarine. Photo by Kathleen Kolt-Bowersox.

Enormous Cat’s-Eye Aquamarine

Jennifer Stone-Sundberg and Si Athena Chen, May 23, 2023

A 586.43 ct cat’s-eye aquamarine is donated to the Smithsonian National Museum of Natural History.

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