The central conflict arises when the young, headstrong widow Lizzie Eustace claims ownership of a valuable diamond necklace that her late husband’s family insists belongs to the estate. Lizzie must navigate the rigid social hierarchies of Victorian England while attempting to maintain her independence and status. She faces opposition from the Greystock family, who view her as an interloper, and various suitors who are motivated by either genuine affection or greed. The narrative framework utilizes a third-person omniscient perspective, allowing for extensive commentary on the legal, financial, and moral dilemmas of the era. The story unfolds through a series of social engagements and legal disputes that test the characters' integrity and social standing.

Readers and critics frequently highlight the novel as a sophisticated examination of greed and social artifice within the Victorian class structure. Discussion often centers on the character of Lizzie Eustace, who is frequently debated as either a manipulative villain or a victim of a restrictive patriarchal society. The pacing is noted for its deliberate, methodical approach to character development, which allows for a deep immersion into the social dynamics of the period. Many observers appreciate the balance between the central mystery of the diamonds and the broader social commentary that defines the work. The novel remains a significant point of interest for those studying the evolution of the realist novel and the nuances of nineteenth-century social mores.