Collections of two leading dealers, Barbara Gladstone and Daniella Luxembourg, hit the auction blocks in New York

Sotheby's will auction collections from two prominent dealers, Barbara Gladstone and Daniella Luxembourg, in New York on May 15. Gladstone's estate consigned 12 lots, including an Andy Warhol painting (est. $1m-$1.5m) and a Richard Prince work (est. $4m-$6m), following a competition between Christie's and Sotheby's. Luxembourg's collection of 15 post-war works, valued at over $30m, features pieces by Lucio Fontana, Salvatore Scarpitta, and Michelangelo Pistoletto, with Fontana's 'Fine di Dio' (1963) expected to lead at $12m-$18m.