The diamond ... cut and ground the rock into a 59-carat jewel, and in 2013, The Pink Star sold for roughly $83 million at auction, becoming the single most expensive gemstone ever sold. The Lulo ...

Christie’s will offer “The Eden Rose,” a 10.20-carat round brilliant ... notably an emerald-cut sapphire and diamond ring of 18.31 carats with an estimate of $150,000 to $250,000.

“The Cartier Astor turquoise and diamond tiara heading to auction is set throughout with old brilliant, single, and rose-cut diamonds, with a principal old brilliant-cut diamond at the ...