Lab also rolling out new comments clarifying impact of fluorescence.
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Three stones in submitted necklace and earrings showed signs of the clarity treatment, lab says.
Revenue from jewelry, watches, clocks and valuable gifts up 14% year on year.
New rate is meaningful reduction, but further easing is necessary to fully revive demand and stabilize exports, industry says.
Watches under pressure, with an estimated drop of 14% to 17%.
Revenue up 12% year on year for eight-week period ending December 27.
Rough sales down 38% year on year in fourth quarter.
HRD Antwerp inaugurates facility in Hyderabad, while IGI opens in Sitapura, Jaipur.
Headquartered in New York, American Gemological Laboratories carries out analysis and provenance reporting.
California-based company held livestreamed jewelry auctions.