NEW YORK — Sotheby’s auction house says its multi-day sales of Rachel “Bunny” Mellon‘s furnishings, art, jewelry and other objects totaled $218 million.

Three works — two paintings by Mark Rothko and a fancy vivid blue diamond — fetched over $30 million.

The 9.75-carat, pear-shaped gem set an auction record for any blue diamond.

More than 1,500 lots were offered over five days. The pre-sale estimate was over $100 million. The last sale was Sunday night.

Proceeds will benefit The Gerard B. Lambert Foundation. It supports The Oak Spring Garden Library in Upperville, Virginia, which houses Mellon’s collection of works related to landscape design, horticulture and natural history.

Mellon died in March at 103. She was a noted horticulturist, heir to the Listerine fortune and the widow of philanthropist Paul Mellon.