A mysterious and historic diamond necklace, believed to be linked to the downfall of French Queen Marie Antoinette, was sold at a Geneva auction for approximately $4.8 million. The 300-carat piece has been associated with royal scandals and has captured significant attention due to its intriguing past. The auction saw fierce bidding, culminating in a final bid that surpassed initial estimates. This sale is part of a larger trend where antique royal jewelry continues to draw high prices at auctions, highlighting the enduring fascination with royal history and its artifacts.