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Figure 1. The two purple to reddish purple chrysoberyl samples from Brazil studied (left images) and two “normal” alexandrites from Hematia, Brazil (right images) in daylight (top) and incandescent light (bottom) illustrate the lower blue-green transmission with increased trivalent chromium. Photos courtesy of Karl Schmetzer.

“Red” Chrysoberyl versus Alexandrite: The Impact of Elevated Chromium Levels on Colour and Colour-Change Properties

Jennifer Stone-Sundberg , October 31, 2014

Overview and commentary on the 2014 Journal of Gemmology article “Purple to Reddish Purple Chrysoberyl from Brazil”.

Summer 2004 G&G Lab Notes

June 1, 2004

This section, from the Summer 2004 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

Prasiolite with Brazil-law twinning in optic-axis direction

Prasiolite with Inclusion Influenced by Brazil-Law Twinning

Meenakshi Chauhan, July 25, 2014

A prasiolite specimen displaying Brazil-law twinning, usually seen in the amethyst variety of quartz, is examined.

14 ornaments of coral veneer glued to matrix

Composite Coral Veneer Glued to Artificial Matrix

Haibo Li, Zhoujing Yue, Jie Liang, Taijin Lu, Jun Zhang, and Jun Zhou , July 25, 2014

Items presented as red coral are revealed by testing to be composite coral veneers over an artificial matrix.

Record-Size Natural Moissanite Crystals Discovered in Israel

Emmanuel Fritsch, Vered Toledo, and Antoinette Matlins, July 25, 2014

Natural moissanite crystals found in Israel has broken world records, with evidence of larger crystals in the area.

Summer 1982 G&G Lab Notes

June 1, 1982

This section, from the Summer 1982 issue of Gems & Gemmology, is a compilation of interesting finds from GIA's laboratories.

Alexandrite cabochon in fluorescent (left) and incandescent light (right).

Cat’s-Eye Alexandrite with Unique Inclusion Pattern

Makoto Miura and Yusuke Katsurada, January 26, 2018

Examination of a chatoyant alexandrite cabochon.

Summer 1987 Gem News International

June 1, 1987

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewellery manufacturing techniques and industry trends.

Summer 1988 Gem News International

June 1, 1988

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewellery manufacturing techniques and industry trends.

This microphotograph shows layered growth zoning associated with intense colour zoning in a faceted synthetic alexandrite grown by Creative Crystals Inc.; immersion, field of view 5.3 × 4.0 mm. Photo courtesy of K. Schmetzer, The Journal of Gemmology.

Decades-Old Synthetic Alexandrite Sheds Light on Modern-Day Research Needs

Jennifer Stone-Sundberg , October 18, 2013

An overview and commentary on the 2012 Journal of Gemmology article, “Flux-grown synthetic alexandrites from Creative Crystals Inc.”

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