Rough diamond crystal. Transmitted and reflected light. Image by Gary Roskin. Diamond provided by AMGAD.

Issue 26, July 21, 2023
Last Newsletter's Top Three Features!
Most notable features from our last report were…

1.) Sotheby's Color Spectacular - Changing it Up

Jewels that feature color change gems! Amazing! Even a Chameleon Diamond! (Not sure what that is? Tap into this feature.)

2.) Inaugural LGD Symposium a Success
Interviews Highlight Best Directions for the Sector

Read what Nirav Jogani and Thomas Chatham told participants regarding the future of Created Diamonds.

3.) Big Names, Big Color, & Big Natural Pearls

You don't see auctions like this very often, with strong groups of colored gems, big named brands, and more...

Support the Report!

Includes advertising packages for the Newsletter!

Those who wish to support the Roskin Gem News Report by placing an Ad, please request a media kit.

More contact information is below.
Our Feature Story
What Can I Do?
State of the Art Jewelry Summit
The first in a series of reviews
Gary Roskin
Roskin Gem News Report

On Friday June 23rd, at Harvard University in Cambridge, Massachusetts, the first annual Jewelry Summit took place, co-hosted by the Responsible Jewelry Council (RJC), the Gemological Institute of America (GIA), and Harvard’s Mineralogical & Geological Museum (MGMH).

Like most gem & jewelry conferences, this one had discussions revolving around sourcing, and social responsibility.

But this conference, this jewelry summit, considered the big picture. They discussed why we should get involved in improving economic growth for all, ending poverty and hunger, and converting to affordable clean energy, reducing global inequalities, and more. It made you think that you can be something more than just a small player in the jewelry industry.

For one day, this was quite a lot to take in… it was mindful, and it was serious.

And it will be more than just one feature story here.

Gemological Importance
Chromium Surface Diffusion
a Trade Alert
Jeffery Bergman, ASG SGC

First documented by the GIA in the early 1990’s, colorless to near-colorless faceted transparent natural sapphires were subjected to high-temperature (1800C+) chromium ion surface diffusion to induce a ruby red color.

This treatment has been virtually absent from the Bangkok market for decades. Until recently.

This exceptional 7+ carat example represented as new production was recently purchased from a broker in Bangkok who properly disclosed its treatment.

However, due to the high potential of misrepresentation, we have issued a TRADE ALERT. - JB

Noteworthy Collection of High Jewelry
Mikimoto: High Jewelry Collection
Praise to the Sea
Mikimoto’s High Jewelry Collection “Praise to the Sea,” is a masterpiece of art and gems.

Their use of cultured pearls, colored gemstones, and diamonds truly highlights the luxury fashion of today. Inspired by the ocean, Mikimoto’s latest collection features many amazing jewels.

Here are the gemological highlights of the collection. (We will leave the artistic narrative to Mikimoto.)

Bigger is Bigger!
Surat Diamond Bourse
Soon Ready for Business
Surat, famously known as the gem capital of the world, holds the distinction of cutting 90 percent of the globe’s diamonds.

The newly constructed Surat Diamond Bourse is poised to become a global hub for over 65,000 diamond professionals, including cutters, polishers, and traders, making it a one-stop destination for the diamond trade.

This grand 15-story building complex sprawls across an astounding 35 acres of land and features nine interconnected rectangular structures, united by a central spine. The impressive construction boasts a staggering 7.1 million square feet of floor space, making it the largest office building in the world!

The official inauguration of this iconic building is scheduled for November this year and will be presided over by Prime Minister Narendra Modi.

Controversial Gems
10 of the World’s Most
Controversial Gemstones

“Gems have been coveted for thousands of years—hoarded by rulers, looted by opportunists, used as bargaining chips by the desperate, and deployed in portraiture to signify wealth and status.

Individual gems, inherited through generations, have dense and illustrious histories of passing between allies and foes that sometimes add to their value and allure. But many of the world’s most famous jewels hide a controversial or mysterious past behind their glittering façades.” – Mental Floss

The 10 most controversial gemstones (according to Mental Floss) are:

Watching Gem-set Watches
Breaking the Final Frontier of Watchmaking
These are the voyages of Jacob & Co. x Concepto Watch Factory for Only Watch


"Breaking the Final Frontier of Watchmaking"

A four-axis tourbillon!

But we love it for its landscape of gemstones! - gr

It’s a world first, gifted to watchmaking’s most illustrious charity. It’s a technological achievement. It’s the acknowledgment of a deep and fruitful partnership between Jacob & Co. and Concepto Watch Factory. It’s proof that being “Inspired by the impossible” makes the impossible come true.

Astronomia Revolution 4th Dimension is fitted with a triple-axis flying tourbillon at the end of a two-arm carousel. It rotates every 60 seconds.

This makes it a four-axis tourbillon, the first ever of its kind fitted in a wristwatch.

Interview with Victoria Gomelsky / JCK Online
Gary Roskin on the Colored Gemstone Market
Even though he’s held numerous roles in the gem and jewelry trade (including senior gem editor at JCK from 1997 to 2009!), Gary Roskin, founder of the Roskin Gem News Report, has always considered himself first and foremost a teacher.

Initiatives in Art and Culture (IAC)
13th Annual International Conference on Gold and Diamonds
"Maintaining Purpose"
July 17-19, 2023
New York, NY
Bohemian National Hall, Upper East Side
Opening Reception: Heritage Auctions New York, 445 Park Avenue

National Association of Jewelry Appraisers NAJA
60th Annual ACEit Mid-Year Education Conference
August 12-14, 2023
Providence, RI
@ the Hilton Providence

Jewellery Valuers Association
JVA Registered Valuer Conference
September 8-10, 2023
Holywell Park, Loughborough University

World Jewellery Confederation CIBJO
Congress 2023
Jaipur, India
October 3rd - 5th
Registration for CIBJO Congress 2023 now open

Greetings from the news desk!

The State of the Art Jewelry Summit, "the Jewelry Summit," will be a strong part of our coverage over the next few months. We will be reporting on each important panel discussion, following up with many of the panelists, and trying to present actions that the industry can implement. Stay tuned.

In the meantime, there are so many other newsworthy items to catch up on. For one, I am finishing up Tom Chatham's book, The Chatham Legacy: An American Story. I will be reviewing that next week. Spoiler alert - it's an absolutely enjoyable read that has made me burst out laughing several times!

Please tell your vendors we would like them to
support the report and advertise!😊

As always, stay informed and keep in touch. I'd like to know where you've been and what gems you've seen.

We will continue to post features on the website, so feel free to log on to the Roskin Gem News Magazine any time at
Want to contribute?
If you would like to contribute, or you have read something somewhere that you feel would be perfect to share with the community, then please feel free to contact me directly at

I will see you again SOON!

Stay safe and stay healthy!

Gary Roskin
The Roskin Gem News Report, Newsletter and online Magazine, is your one-stop destination for all current global gem news.

You are receiving this newsletter because you were most likely already on our subscribers list or we picked up your business card somewhere along the way. We would love for you to remain a subscriber. To do so, please tap the subscribe button and complete the form.

If you wish to be removed from our mailing list, please tap the unsubscribe line below and complete the form.

If you feel your membership association, club, or school would find value in this free report, please let us know. Contact information is provided below.
Roskin Gem News
+1(610) 269-0121 text/call/WhatsApp
The creation of this newsletter is the work of Gary A. Roskin Ltd, dba Roskin Gemological Services. If you should have any comments or suggestions regarding the contents of this newsletter, please do not hesitate to contact us at
Hardcopy mail correspondence:

Roskin Gem News
256 Eagleview Blvd., suite 357
Exton, PA 19341 USA