0.30 ct. RAPI up 4.2%, a bigger gain than in May.
Category: Auction
Cushion-shaped, 23.90-carat, fancy-yellow diamond takes top spot, fetching $289,621.
13.33-carat yellow with $120,000 high estimate will lead sale.
Stone expected to fetch up to $3.5 million at New York auction.
Toi et moi ring by Mouawad estimated to bring in up to $1.9 million at London auction.
Cyberattackers took a limited amount of personal client information, but not financial or transactional, according to company.
Piece was top-selling lot of Hong Kong Luxury Week, bringing in $8.7 million.
A Rockefeller and a utilities heiress are among the former owners of the items on offer.
10.20-carat stone is most significant of its cut and color to be offered in 12 years, according to company.
2.68-carat piece will lead Hong Kong Magnificent Jewels auction.
Company expects jewel to fetch up to $1.9 million at New York auction.