Largest Diamond on Auction Internally Flawless – D – 163 Ct

Diamond Auction

 Largest Diamond Ever on auction Internally Flawless – D – 163 Ct

Introducing the Art of De Grisogono by offering the largest diamond flawless D-colour diamond ever to come to auction – de GRISOGONO and Christie’s

An e emerald shape fancy cut diamond mined  by Lucapa Diamonds and cut from a 404 carat rough diamond stone – the largest diamond ever recovered in Angola – isl going under the hammer come 14 November 2017 at Christie’s in Geneva.

Set into an asymmetric necklace designed by de GRISOGONO, this 163.41 carat, flawless D-colour emerald-cut diamond is the largest ever to come to auction

In February 2016, Lucapa Diamond Company announced the discovery of the biggest recorded diamond in Angola, confirmed as a Type IIa D-color gem-quality stone. The 404-carat diamond from the Perth-based company’s Lulo project is also the 27th biggest recorded diamond in the world and the biggest diamond ever discovered by an Australian company.

Nikolas Polka, CEO of diamond consortium Nemesis International, bought the rough stone and turned to Fawaz Gruosi, founder and creative director of De Grisogono, a Geneva-based jeweler.

A team of more than 10 specialists transformed the 404.20 carat diamond – the largest they had ever worked with – into the final cut-and-polished gem.

Christie’s statement above describes how, “Diamond expert Isaac Barhorin spent weeks examining the stone in different lights … ‘I start by seeing what the stone can give,’ Barhorin explains. ‘I am looking for cracks, grainy spots, feathers and carbon spots, and I will build the stone around these.

The goal is to reach an internally flawless stone.’ Using a felt-tip pen, he marked where the first cuts should fall.. They go on to explain how, “On 29 June 2016, after months of analysis, 80-year-old master diamond cleaver Ben Green was ready to go to work. A diamond cutter since 1964, Green is respected as the number-one cleaver in the world. ‘Diamond is like wood, it has a grain,’ he says. ‘You can saw it or divide it along the grain.’ Using the traditional low-tech tools of the diamond cleaver’s trade – dark cement to hold the diamond in place on the wooden stump, a loupe and two flat blades- Green split the stone cleanly in two.”

The diamond that was extracted from it is one of the largest D-Flawless emerald-cut diamonds the GIA has ever seen, and the largest ever to be offered for sale at auction. “The extreme rarity of a diamond of this quality cannot be overstated,” GIA researchers wrote in their monograph on the stone.

De GRISOGONO founder Fawaz Gruosi and his team of five master craftsmen and women then setting about transforming this hug stone into a wearable piece of jewelry. Gruosi and his team eventually decided on an asymmetric design featuring 18 emerald-cut diamonds on one side, with the 163.41-carat diamond as the centrepiece. After being sent on a tour to Hong Kong, London, Dubai and New York, the 163.41 carat, flawless D-colour emerald-cut diamond will be offered in Christie’s Magnificent Jewels  sale on 14 November in Geneva.


Giant diamond originating from the largest rough in Angolan history will go under the hammer at Christie’s in Geneva in November.

28 September-1 October 2017
22nd Floor, Alexandra House, 18 Chater Road Central

4-7 October 2017
8, King Street, SW1Y 6QT London

de GRISOGONO in Dubai
17-19 October 2017

4-5 November 2017
Rockefeller Centre, 20 Rockefeller Plaza

Contact Corlia Roberts for more on diamonds, diamond auctions or Diamond Courses 


Dona Dirlam Retires

Dona Dirlam

Dona Dirlam Retires as Director of the Richard T. Liddicoat Gemological Library and Information Center

CARLSBAD, Calif. – August 29, 2017 – Dona Dirlam, director of GIA’s library and information center, retired August 25 after 38 years of service to GIA’s (Gemological Institute of America) mission of ensuring the public trust in gems and jewelry. She was largely responsible for establishing and expanding the Richard T. Liddicoat Gemological Library and Information Center, now the world’s leading resource center for gems, gemology and jewelry. Dirlam’s successor will be Robert Weldon, who has been manager of photography and visual communications for GIA since 2006.

Dirlam has long been recognized for her innovation and contributions to the industry. She received the Outstanding Gemologist Award from the Association of Women Gemologists in 1989 and GIA’s Staff of the Year award in 1991. In 2004 she received GIA’s highest honor, the Richard T. Liddicoat Distinguished Achievement Award. In 2015 she received the Accredited Gemologists Association Lifetime Achievement Award and in 2016 was honored with the Women’s Jewelry Association’s Award for Excellence in Special Services. She has coauthored more than a dozen articles for GIA’s quarterly professional journal Gems & Gemology (G&G), five of which received a G&G Most Valuable Article award.

Over Dirlam’s tenure she expanded the collection to more than 57,000 books, 700 journal and magazine titles, 198,000 digital images and 1,800 video recordings. With the addition of the 14,000-volume John & Marjorie Sinkankas Gemological Library in 1987 and the creation of the Cartier Rare Book Repository & Archives in 1998, she has helped to build the world’s largest library for information on gems and jewelry. Her commitment to providing greater access to GIA’s rare books led to a significant project to digitize the collection’s rarest holdings and make them available for free to the public and global gem industry. Since the project launched in 2015, more than 300 books have been scanned and are available at

“Dona’s groundbreaking efforts on behalf of the Institute’s research, education, and outreach capabilities have kept GIA at the forefront of gemological scholarship,” said Susan Jacques, president and CEO of GIA.

“Cultivating our library’s collection and creating accessibility for the public has been the library’s main goal,” said Dirlam. “It takes dedicated individuals to handle the projects that come through our door and for that I am honored to have worked with a phenomenal team. What we have accomplished in the past decades will continue under the leadership of Robert Weldon.”

Weldon assumed responsibilities as library director on Dirlam’s retirement. He plans to carry on Dirlam’s legacy of expanding GIA’s collection and making it available to students, the trade and the public.

Dona Dirlam
Robert Weldon named Director of the Richard T. Liddicoat Gemological Library and Information Center. Photo: Judy Colbert/GIA

Dirlam holds a Master of Science degree in Geology and Geophysics from the University of Wisconsin (Madison). She began her career as an earth sciences teacher before following her passion for minerals and gems to GIA’s Santa Monica campus in 1979. Upon completion of her GIA Graduate Gemologist (GG) diploma, she joined the Institute as a staff gemologist and later was offered the opportunity to build the Institute’s library by Liddicoat himself. She began as a GIA research librarian in 1980 and became the director of the library in 1995. She also served as abstract editor of G&G from 1981-1994 and has given more than a hundred lectures on a variety of historical topics.

Weldon has a Bachelor of Science degree in Business Administration from the University of Arkansas (Fayetteville). After receiving his GIA GG in 1987, Weldon spent three years working in the GIA library for Dona Dirlam. In 1990, he joined JCK magazine as colored gemstone editor; he later joined Professional Jeweler as senior writer. Since returning to GIA in 2006, his photographs and articles have been featured in numerous gemological, jewelry and consumer publications. He has authored or co-authored more than half dozen articles in G&G and his photographs have appeared on 31 of its covers.

Scholarships for 2018

GIA Scholarships

Scholarship Applications accepted August 1 to September 30

CARLSBAD, Calif. – July 31, 2017 – GIA will begin accepting scholarship applications Aug. 1 for its 2018 Gemology and Jewelry Manufacturing Arts programs, courses and lab classes. GIA scholarships, which total over $2 million for 2018, align with the Institute’s goals of providing quality education in gemology and jewelry to the trade and aspiring professionals. Applications for the current scholarship cycle will be accepted through Sept. 30 and are available at

Since 2010, GIA has awarded more than $8 million in scholarships to more than 1,500 students globally. Funded by the GIA endowment fund and several private donors, the scholarships supplement GIA’s wider scope of offerings. Beginning with the 2018 application cycle, applicants can apply for scholarships every calendar year. GIA offers on-campus and distance education (eLearning and lab classes) scholarships.

Scholarships are available for distance education eLearning courses and for classes at the Institute’s campuses in Bangkok, Carlsbad, Hong Kong, London, Mumbai, New York and Taiwan; and at the GIA branch in Dubai. For more information, call +1(760) 603-4131 or contact us.

About GIA
An 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.