Lab also rolling out new comments clarifying impact of fluorescence.
Category: Auction
Piece is estimated to fetch up to $3.2 million at April 23 sale.
A Cartier ruby ring sells for $560,000, more than eight times its high estimate.
Piece sells for $691,522 at Hong Kong Jewels auction.
Lead item is a Van Cleef & Arpels diamond ring, but six of the top 10 contain the blue gemstone.
Stone from Jwaneng mine will feature in Sotheby’s Hong Kong luxury sale on April 23.
10.02-carat Tiffany & Co. diamond ring is top seller, fetching $520,700.
Ring centering 26-carat stone brings in $1.3 million at recent London auction.
9-carat gemstone will carry $833,000 high estimate at the March 30 sale.
26-carat stone to carry $1.3 million high estimate at March 17 London sale.
Ring carries a $700,000 high estimate at March 19 Jewels Online sale.