Advisor, USA

Having a love for gems but no family tradition in the trade Bilgore understood the need to condense generations of learning. He gained professional training which took him well beyond any graduate gemologist diploma. Bilgore's work at the American Gemological Laboratories the world’s premier gemological laboratory specializing in colored gemstones, gave him a priceless foundation. He analyzed gems for identification, grading for quality, detection of treatments, and determination of country of origin, all in one place and at the highest level. This experience gives Bilgore a perspective few gemologists in the world ever achieve.

 In the gem lab Bilgore began an advanced study of gemstone cutting, working with the renowned master gem cutter Reggie Miller. The diamond world has its ‘Ideal Cut’, and he wanted to explore and develop its equivalent for colored stones.

Bilgore went from professional gemologist to professional gem buyer. He was the gem buyer for HENRY BIRKS JEWELERS whose companies included the carriage firms of Shreve, Crump & Low, J.E. Caldwell’s, C.D. Peacock, Shreve & Co., and J. Jessop’s.

The next 16 years, he was privileged to work  at OSCAR HEYMAN & BROTHERS, one of the oldest and most prestigious American jewelry manufacturing firms. Behind the scenes Bilgore bought gems for Tiffany & Co, Van Cleef & Arpels, Graff, and many other of the most sought after jewelry brands. As Oscar Heyman’s primary Gem Buyer, he traveled the world, developing close relationships and procuring the finest gems.

Board of Directors

Benjamin Hackman

President, USA

Damien Cody

Vice President, Australia

Santpal Sinchawla

Vice President, Thailand

Marcelo Ribeiro

Treasurer, Brazil

Bruce Bridges

Secretary, USA

Ehud Harel

Secretary, Israel

E. Gamini Zoysa

Secretary, Sri Lanka

Alice Muthama

Director, Kenya

Captain Ramji Sharma

Director, Japan

Duncan Mclauchlan

Director, UK

Gabriel Angarita

Director, Colombia

Henry Ho

Director, Thailand

Masaru Mizumura

Director, Japan

Nirmal Kumar Bardiya

Director, India

Pavel Sokolov

Director, Russia

Philippe Scordia

Secretary & Director, France

Rakesh Jain

Director, Hong Kong

Shirley Xue Li Zhang

Director, Hong Kong

Stephan Reif

Director, Austria

Vijay Kedia

Director, India

Warren F. Boyd

Director, Canada

Yu Xiaojin

Director, China

Clement Sabbagh

Advisor, Brazil

Jean Claude Michelou

Advisor, Colombia

Jeffrey Bilgore

Advisor, USA

Wilson Yuen

Immediate Past President, Hong Kong

Gary Roskin

Executive Director, USA

About Us

The ICA is a worldwide body specifically created to benefit the global colored gemstone industry by advancing and promoting the knowledge and appreciation of colored gemstones.
New York Office: 31 West 47th St., Suite 1103, New York, NY 10036
+1 (212) 620-0900
ica (at)
Hong Kong Office: Unit 311B, 3rd Floor, Heng Ngai Jewelry Centre No. 4 Hok Yuen Street East, Hung Hom, Kowloon, Hong Kong
+852 2365-9318
ica (at)

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