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This pristine hexagonal platelet of graphite was seen in a pink sapphire from Sri Lanka. Photomicrograph by Jeffrey Hernandez; field of view 1.99 mm.

Pink Sapphire with Graphite Inclusion

Jeffrey Hernandez, August 4, 2023

A hexagonal platelet of graphite is discovered in a pink sapphire from Sri Lanka.

This “snail” inclusion was viewed through the upper half facet of a 4.00 ct near-colorless diamond. The purple-red “shell” was identified as pyrope garnet, while the green “body” was determined to be diopside. Photomicrograph by Christopher Vendrell; field of view 1.99 mm.

“Snail” in Diamond

Christopher Vendrell, August 4, 2023

A combination of pyrope garnet and diopside inclusions is reminiscent of a snail in a near-colorless diamond.

Trigons creating the impression of a thin and patchy “yellow skin” on a 0.98 ct rough diamond. Photomicrograph by Nicole Ahline; field of view 2.34 mm.

Patchy Yellow Trigon

Nicole Ahline, August 4, 2023

Isolated nitrogen confined to the outer surface of a 0.98 ct diamond causes “yellow skin.”

Rare Double-trapiche Emerald

Tao Hsu, March 29, 2013

At the AGTA show, Equatorian Imports showed this contributor two pieces of emerald with a very rare double-trapiche pattern

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Summer 2023 G&G Available Now

Erica Zaidman, August 4, 2023

An overview of the Summer 2023 Gems & Gemology content.

Solid Carved Dark Gray Diamond Ring

Stephanie Persaud, Paul Johnson, and John King, July 22, 2020

Graphite needles create the dark gray color of a most unusual solid diamond ring carved from Canadian rough.

Round brilliant diamond and a photomicrograph of its largest corundum inclusion.

Corundum Inclusions in Gem Diamond

Garrett McElhenny, Michael Turner, and Christopher M. Breeding, July 22, 2020

Rare chromium-rich corundum inclusions in a natural gem diamond provide a window into the deep earth.

Wallastonite and CaSiO3-breyite in colorless diamond.

Diamond with Cavities Showing Radiation Evidence

Sally Eaton-Magaña and Garrett McElhenny, July 22, 2020

Diamond formed at incredible depth shows evidence of radioactive fluids in cavities surrounded by green fluorescence halos.

Figure 2. Layers of limestone and chert plastically deformed and folded at high pressure and temperature during metamorphism. Photo by Dieter Mueller (dino1948)/licensed under CC BY SA 4.0.

Gems Formed in Metamorphic Rocks

Aaron C. Palke and James E. Shigley, August 4, 2023

Gemstones formed in metamorphic environments offer insights into the earth’s history and the evolution of tectonic activity that led to their formation.

Vietnamese peridot nodules, rough stones, and faceted samples

Peridot from the Central Highlands of Vietnam: Properties, Origin, and Formation

Nguyen Thi Minh Thuyet, Christoph Hauzenberger, Nguyen Ngoc Khoi, Cong Thi Diep, Chu Van Lam, Nguyen Thi Minh, Nguyen Hoang, and Tobias Häger, November 7, 2016

Analyzes the gemological and geochemical characteristics of peridot from the Gia Lai province alongside specimens from other localities to gain insight into its formation.

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