Country overtook Botswana in 2023.
Piece carries an estimate of up to $268,000.
Sales in America up 14% for full year.
Jewelers of America (JA) chief financial officer will succeed Terry Chandler in role.
A pair of pearl and diamond earrings fetches more than 23 times expected price.
She led the department from 2009 to 2014.
Sara Yood, Raja Shah and Mélanie Matthes join organization.
Institute will now sort submissions into five separate classifications.
Miner sells 1.5 million carats, accounting for 94% of lots.
Fancy-vivid-pink ring will be among top pieces at May 22 sale.
Company also owns the Braúna deposit in Brazil.