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Monday, December 21, 2015

Fall 2015 Gems & Gemology: Colombia’s One-of-a-Kind Trapiche Emeralds

 Press Release via GIA

Fall 2015 Gems & Gemology: Colombia’s One-of-a-Kind Trapiche Emeralds
HPHT-grown synthetic diamonds, Lesotho’s renaissance, and white nephrite origin study

FA_2015 GG coverThe Fall 2015 issue of Gems & Gemology (G&G), GIA’s quarterly professional journal, offers a comprehensive look at a stone that intrigues many gemologists – Colombia’s one-of-a-kind trapiche emerald. The issue, which is now available in print and online, also investigates recent breakthroughs in colorless to near-colorless HPHT-grown synthetic diamonds, how Lesotho’s Let¹eng-la-Terae diamond mine became one of the world’s richest, and the provenance of dolomite-related white nephrite jade using a new method of statistical analysis.

G&G’s cover story “Colombian Trapiche Emeralds: Recent Advances in Understanding Their Formation” presents a comprehensive paper on the unique trapiche emeralds from Colombia. In fine specimens, the combination of rich, gemmy green color with the six-spoke pattern is particularly striking. The article, headed by UCLA postdoctoral researcher Isabella Pignatelli and Gaston Giuliani, director of the French Institute of Research for Development, reviews the geology of trapiche emerald, provides 3-D petrographic examination of crystals along with spectroscopic and chemical analyses, and proposes a new formation model informed by their recent work.

Next, a team led by GIA research scientist Ulrika D’Haenens-Johansson investigates the gemological properties of 44 colorless to near-colorless HPHT-grown synthetic diamonds recently produced by a Russian firm, New Diamond Technology. Ranging up to 5.11 ct, these HPHT synthetics show dramatic improvement in size, color, and clarity. The issue’s third article, by GIA’s Russell Shor and Robert Weldon and three leading diamond researchers, profiles the Let¹eng mine in Lesotho to explain how the operations have been adapted to promote recovery of the mine’s biggest diamonds and increase profitability. In the fourth and final paper, Zemin Luo, Mingxing Yang and Andy Shen from the China University of Geosciences in Wuhan apply a new statistical analysis method to the provenance of dolomite-related white nephrite. This technique could prove useful in accurately determining the geographic origin of other gemstones.

The issue also features G&G’s regular Lab Notes and Gem News International sections, which include informative entries from contributors around the world. The second installment of the G&G Micro-World column features descriptions and photomicrographs of remarkable inclusions.

G&G’s free archive containing every issue from 1934 to present, more in-depth coverage, hundreds of additional photos, and exclusive video footage are available on GIA’s website at http://www.gia.edu/gems-gemology.  



About GIA
cid:image001.jpg@01D0558D.CBE8DD90An independent nonprofit organization, GIA (Gemological Institute of America), established in 1931, is recognized as the world’s foremost authority in gemology. GIA invented the famous 4Cs of Color, Clarity, Cut and Carat Weight in the early 1950s and in 1953, created the International Diamond Grading System™ which, today, is recognized by virtually every professional jeweler in the world.

Through research, education, gemological laboratory services, and instrument development, the Institute is dedicated to ensuring the public trust in gems and jewelry by upholding the highest standards of integrity, academics, science, and professionalism. Visit www.gia.edu

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