The Affair of the Diamond Necklace was an incident in the 1780s at the court of Queen Marie Antoinette. The reputation of the Queen, already tarnished, was ruined by the implication that she had participated in a crime to defraud the crown jewellers of the cost of a 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.