Connect with us

Press Releases

Fall 2017 Gems & Gemology Features Colored Gemstones and Synthetic Diamonds

mm

Published

on

Fall 2017 Gems & Gemology Features Colored Gemstones and Synthetic Diamonds

(PRESS RELEASE) CARLSBAD, CA – The fall issue of Gems & Gemology (G&G), Gemological Institute of America’s quarterly professional journal, is available in print by subscription and in the GIA Store, and digitally – at no cost – on GIA.edu. The six articles featured in this issue cover HPHT synthetic diamonds, historical saltwater pearls from the New World, the photoluminescence (PL) spectra of emeralds, synthetic star corundum and the Colombian emerald industry from mine to market.

The issue opens with “Observations on HPHT-Grown Synthetic Diamonds: A Review,” the first comprehensive summary published on a large sample of several thousand HPHT synthetic diamonds, all of which were examined by GIA from 2007 through 2016. GIA researchers Drs. Sally Eaton-Magaña, James Shigley and Christopher M. Breeding investigate trends in the distinctive features seen among HPHT synthetic diamonds from multiple sources over the past ten years.

In “Saltwater Pearls from the Pre- to Early Columbian Era: A Gemological and Radiocarbon Dating Study,” researchers at GIA and the Gübelin Gem Lab examine 85 natural saltwater pearls reportedly recovered from Caribbean waters to determine their origin and 14C isotope radiocarbon dating. The research team, led by GIA’s Chunhui Zhou, confirmed that the pearls originate from a Pinctada species.

The next article is “Photoluminescence Spectra of Emeralds from Colombia, Afghanistan, and Zambia.” Researchers led by Dr. D. Brian Thompson of the University of North Alabama investigated the PL spectra of 48 samples from these regions. Their research strongly indicates that variations in trace element concentration within emeralds from these localities correlate with their PL spectra, which could be very promising for determining the geographic source.

The fourth article, by Dr. Karl Schmetzer, Prof. H. Albert Gilg and Dr. Heinz-Jürgen Bernhardt, is “Synthetic Star Sapphires and Rubies Produced by Wiede’s Carbidwerk, Freyung, Germany.” These stones were grown using a variation of the Verneuil method followed by controlled annealing that exsolved the rutile needles, giving these cabochons a distinctive appearance.

Advertisement

“True Colors of ‘Dalmatian Jasper’” explores the details of this popular gemstone whose unique spots are similar to the coat of a Dalmatian. Tomasz Powolny and Dr. Magdalena Dumańska-Słowik determine that this stone’s composition and gemological characteristics do not meet the definition of jasper. Their recommended term is “Dalmatian stone.”

The last article, “The Colombian Emerald Industry: Winds of Change,” explores the history, geology and ongoing transformation of the Colombian emerald market. Darwin Fortaleché, chief gemologist at Colombia’s CDTEC lab, and his GIA coauthors provided this comprehensive field report.

G&G’s Lab Notes section features an entry on the separation of synthetic melee from natural diamond using GIA’s iD100 screening device. The Micro-World section includes hematite roses and a “flower-in-the-rain” inclusion within a Sri Lankan sapphire, while the Gem News International section spotlights blue-green pyrope-spessartine with high vanadium content and two potential new sources of Nigerian sapphire.

This and every issue of G&G since 1934, including full articles, photo galleries and exclusive video footage, are available at no cost on GIA’s website at https://www.gia.edu/gems-gemology.

Additional research articles are available at http://www.gia.edu/gia-news-research.

Print subscriptions and copies of back issues are available at http://store.gia.edu, or by contacting G&G customer service at +1 760-603-4502.

Advertisement

For press inquiries, please contact Nellie Barnett at [email protected] or +1 760-603-4184.

Advertisement

SPONSORED VIDEO

Wilkerson Testimonials | Sollberger’s

Going Out of Business Is an Emotional Journey. Wilkerson Is There to Make It Easier.

Jaki Cowan, the owner of Sollberger’s in Ridgeland, MS, decided the time was right to close up shop. The experience, she says, was like going into the great unknown. There were so many questions about the way to handle the store’s going-out-of-business sale. Luckily for Cowan, Wilkerson made the transition easier and managed everything, from marketing to markdowns.

“They think of everything that you don’t have the time to think of,” she says of the Wilkerson team that was assigned to manage the sale. And it was a total success, with financial goals met by Christmas with another sale month left to go.

Wilkerson even had a plan to manage things while Covid-19 restrictions were still in place. This included limiting the number of shoppers, masking and taking temperatures upon entrance. “We did everything we could to make the staff and public feel as safe as possible.”

Does she recommend Wilkerson to other retailers thinking of retiring, liquidating or selling excess merchandise? Absolutely. “If you are considering going out of business, it’s obviously an emotional journey. But truly rest assured that you’re in good hands with Wilkerson.”

Promoted Headlines

Most Popular