The Eustace Diamonds is a novel by Anthony Trollope, part of the Palliser series, that centers on the morally ambiguous character of Lizzie Greystock, who becomes Lady Eustace after marrying the wealthy but ailing Sir Florian Eustace.After a brief marriage that produces a son, Sir Florian dies, leaving Lizzie in possession of a diamond necklace valued at ten thousand pounds.

The necklace becomes the focal point of contention as Lizzie claims it was a personal gift from her husband, while the family lawyer, Mr. Camperdown, insists it belongs to Sir Florian's estate. This dispute leads to a series of legal and social complications.Lizzie is portrayed as clever and beautiful but deeply flawed, characterized by her penchant for deceit and manipulation. Her relationships with various suitors become increasingly strained as the scandal surrounding the diamonds unfolds.