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Peridot

Found in lava, meteorites, and deep in the earth's mantle, yellow-green peridot is the extreme gem

Peridot
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Figure 11. Double-strand natural saltwater pearl necklace. Photo by Robert Weldon; courtesy of Karmshil Enterprise. Alexandrite exposed to incandescent illumination (left, red) and daylight-equivalent illumination (right, green). Photos by Robert Weldon; courtesy of GIA’s Dr. Edward J. Gübelin collection, no. 33805. Ring containing a CVD-grown diamond. Photo by Johnny Leung.

Large Peridot from Myanmar with an Eight-Rayed Star

An eight-rayed star peridot with a star system made up of two different sets of inclusions is described for the first time.

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Figure 1. This 0.73 ct octagonal step cut was composed of chrysoberyl and alexandrite. The alexandrite portion showed a color change from blue-green in fluorescent light to red-purple in incandescent light. Photos by Shunsuke Nagai.

Rainy Lakeside City in Peridot

Blade-like magnetite inclusions developed from a healed fracture in peridot resemble a dark, rainy afternoon in a lakeside city.

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An octahedral fluorite crystal in a 1.25 ct Brazilian alexandrite. Photomicrograph by Hikaru Sato; field of view 2.37 mm.

Ancient Script-Like Serpentine in Brown Peridot

Examination of a brown peridot xenocryst reveals thread-like serpentine inclusions resembling ancient text.

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This 0.69 ct alexandrite showed a stellate structure due to cyclic crystal twinning and pleochroism, producing a kaleidoscope effect when rotated. These photomicrographs were taken with a single polarizer placed above the stone and a white diffuser below the stone to highlight the color. Photomicrographs by Makoto Miura; field of view 9.80 mm.

Large Faceted Pallasitic Peridot

A large specimen of extraterrestrial peridot is analyzed at the Carlsbad laboratory.

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Figure 1. Top: Negative crystal in an alexandrite containing a fluid and crystals at room temperature. Bottom: Below 31.2°C, multiple gas bubbles appear. Photomicrographs by Jamie Price; field of view 1.99 mm.

“Fishbone” Inclusion in a Burmese Peridot from Mogok

Examination of Burmese peridot with impressive size, color, and clarity reveals a fishbone-shaped inclusion.

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Gemstone classics from sources old and new

Gemological Characterization of Peridot from Pyaung-Gaung in Mogok, Myanmar

Examines the mining and the internal, spectroscopic, and chemical features of peridot from this deposit, which possesses a rich olive green color and is available in large sizes.

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A group of rings featuring alexandrite from Brazil

Namak Mandi: A Pioneering Gemstone Market in Pakistan

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.

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Field gemologists sort through gem gravel in Myanmar

Arizona Road Trips: Wild West Gem and Mineral Localities

Arizona’s scenic desert and mountain landscape is the perfect backdrop for a modern Wild West road trip in search of gem and mineral treasures.

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A large group of people outside on GIA’s Carlsbad, California  campus.

Fine Gems and Update from Myanmar

A look at top-quality gems and insight into a delegation’s visit to gem mines in Myanmar.

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Interference figures in faceted alexandrite

Gems and Minerals from the Subarctic

Circumnavigate the boreal reaches of the globe to explore gems from polar regions.

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