DiamondBuzz
GIA icon Tom Moses to retire after 50-year legacy
Legendary gemologist who helped shape global diamond grading standards steps down after five decades at GIA
Tom Moses, executive vice president and chief laboratory and research officer at the Gemological Institute of America (GIA), is set to depart after nearly 50 years of trailblazing service.
Moses spearheaded GIA’s global footprint, elevating it to the pinnacle of gemology and education worldwide, the institute announced last week. He’ll stay on through May’s end to ensure a seamless handover, then transition to chief of gemological research emeritus—a fitting tribute to his indelible mark.

“The rigor Tom infused into grading, the discipline he championed in science, the laser focus on customers, and the humility in leadership embody GIA’s gold standard,” said GIA CEO Pritesh Patel. “His five decades aren’t just tenure—they’re the engine of our explosive growth, fueled by relentless commitment, curiosity, and command.”
A graduate gemologist since joining GIA’s California lab in 1976, Moses climbed through key leadership posts, co-authored over 100 technical papers in Gems & Gemology and peer journals, snagged the 2002 Richard T. Liddicoat Award, and joined the board of governors in 2013.
DiamondBuzz
Diamond Market Shows Resilience As Large Stones And Fancy Shapes Drive Demand
Global Sector Reports Stable Fundamentals Ahead Of Key Industry Events
The global diamond sector is maintaining overall stability, with notable strength emerging in large, high-quality stones and fancy elongated shapes, according to the latest trade intelligence.
Diamonds in the 7–9.99 carat range are experiencing robust demand, while 10-carat-and-larger sizes — particularly D-Flawless rounds — continue to sell briskly. Smaller round stones in the 0.30–0.89 carat range are also showing signs of stabilization after a period of softness.
The Bharat Diamond Bourse in Mumbai is anticipating a market recovery following a temporary Iran ceasefire, with optimism returning among regional traders. However, manufacturers are adopting a wait-and-see approach ahead of next week’s De Beers Sight April 27–30, with a modest allocation widely projected. Indian factories are preparing for May summer closures, leading to a deferral in rough buying activity.
On the supply side, Angola has forecast an 8% increase in rough diamond production for 2025, projecting output of 15.2 million carats — a development expected to support broader market supply.
Fancy elongated shapes — including ovals, marquises, and emeralds — are outperforming rounds in the 2-carat-and-larger segment. High-quality marquises are commanding the highest premiums in the market, with long radiants and long cushions also facing notable supply constraints. In India, 2-carat-plus sizes are advancing, supported by sustained U.S. demand and rough shortages that are providing upward price support for polished stones.
Israel’s market is observing a temporary pause in activity due to Memorial Day and Independence Day observances. In the United States, the National Retail Federation projects $7.5 billion in Mother’s Day jewelry sales on May 10.
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