Leo Schachter Diamonds
Ben Mellen & Son
Star Rays New York
House of Diamonds
Sparkling Jewels USA
Diajewels of New York
Flawless Diamond Jewelry
Simplex Diam
Palak Diam
Yondor Diamonds
Mo King Ran
SB Diamonds
Yaron Gems
A. Hakimi & Sons

GIA – Gemological Institute of America
The Verma Group
AS Diamonds
Kuperman Brothers Diamonds
Valentine Jewels
Dalumi Diamonds
S. Schnitzer
Heera Moti
OM Diamonds
Espeka Belgium
Esskay Gems
NIG Corporation
United Color Gems
Lali Jewelry
Blue River Gems
Guy Leeser Diamonds
Danny Messing

Christopher Designs
HBS Diamonds
Malca Amit
Sarine Technologies
DBS Diamonds
New York Loan Company
Yerushalmi Brothers
Kristall Smolensk
Corey Friedman Fine Jewelry
Swiss Diam
The Gulaylar Group
Sterling Jewelers
ADA Gems
M&H Diamond Manufacturing
I. Hennig


Recognized as one of New York City’s most active real estate developers, Extell Development Company is a nationally acclaimed developer of commercial, residential, retail, hospitality and mixed-use properties operating primarily in Manhattan. Since its founding in 1989, Extell has experienced outstanding growth, with a portfolio that exceeds 20 million square feet, with transactions totaling over $10 billion USD. Setting new standards in the real estate industry, Extell has earned a stellar reputation for its dedication to the development of superior quality properties distinguished by sophisticated design, gracious floor plans, and first class amenities. The International Gem Tower is the vision of CEO Gary Barnett, who, prior to his real estate career, worked internationally in the diamond industry. The International Gem Tower is New York City's only commercial condominium designed specifically for the global diamond, gem and jewelry industry.