Sales at high-end car auctions in Pebble Beach and Monterey, California, fell 14 percent from last year.
Sotheby's surged as quarterly results top expectations.
U.S. equities close slightly lower, despite a rise in oil prices, as investors awaited key retail sales data due later this week.
U.S. sovereign bonds pared some losses on Monday but remained lower in the wake of Friday’s better-than-expected nonfarm payrolls report.
Some of the names on the move ahead of the open.
Wall Street stock indexes looked set to open higher on Monday after the better-than-expected U.S. non-farm payrolls number on Friday.
The highest bid for the uncut "Lesedi La Rona" stone was $61 million, which was below the minimum reserve price.
The U.K.'s vote to exit the European Union is expected to pressure results at this week's London auctions.
A 14.6-carat blue diamond auctioned at a Christie's in Geneva for $57.5 million, becoming the most expensive diamond ever auctioned.
Big spenders paying record-breaking prices are offsetting lighter volume for upscale-art auction houses.
CNBC's Robert Frank reports on Yusaku Maezawa, Japanese businessman and art collector, who bought $98 million worth of art in just two days.
CNBC's Robert Frank looks at Sotheby's first quarter earnings and how the art auction season is kicking off.
Sotheby's and Christie will hold art auctions this week with totals expected to top $1 billion, half of last year. CNBC's Robert Frank reports one mystery bidder may have his eye on Sotheby's itself.
Sotheby's disclosed on Monday that an outside investor has expressed interest in buying at least 10 percent of the company.
U.S. stock index futures pointed to a mixed open as oil prices reversed to trade about 1 percent lower.
Colossal diamond is the size of a tennis ball
CNBC's Robert Frank and Sotheby's Lisa Hubbard talks about the history behind the rare diamond and its $25-35 million price tag.
This "vivid pink" diamond has the highest possible grading from the Gemological Institute of America. How much do you think it will sell for?
Sotheby's is planning to sell one of the largest private wine collections in the United States owned by billionaire William Koch.
The diamond, which is being auctioned off by Christie's, could set a new record for a blue stone.