Gem and Jewellery Historian
Gold and Fire - A History of Jewellery Technology
Gemmologist / Valuer and Expert Witness
Opportunities of a Career through Valuing
Gemmologist, Gem Trader and Author
Gems with a Star – A Fascinating and Colorful World
Expert Gemmologist / Founder & Principal of AGIL
Gems and Gemmology Development in the Greater China: An Overview
Gemmologist / Valuer and Expert Witness
Advanced instrumentation for gemstone testing - Advantages and limitations
Chairman of the Jewellers' and Goldsmiths' Association of Hong Kong
Sustainability and Innovation: A New Era for the Jewellery Industry
Member of Advisory Peer Group (APG): Gemmology and Jewellery Studies Programme
Chief Executive Officer of Lee Heng Diamond Group
Ending Speech Guest Speaker
