The Affair of the Diamond Necklace was a mysterious incident in the 1780s at the court of Louis XVI of France involving his wife, Queen Marie Antoinette. The reputation of the Queen, which was already tarnished by gossip, was ruined by the implication that she had participated in a crime to defraud the crown jewellers of the cost of a very expensive diamond necklace. The Affair was historically significant as one of the events that led to the French populace's disillusionment with the monarchy, which, among other causes, eventually culminated in the French Revolution.