The diamond necklace was also worn during two British coronations. As they say, a piece of jewelry has the power to tell many stories. This particular diamond necklace, which is being sold by Sotheby's this fall for an estimated $2.8 million, tells royal-related ones both good and bad.

In November, a 300-carat necklace will be auctioned off at Sotheby's auction house in London. The stones in the necklace may have come from a necklace that belonged to Marie Antoinette. The jewelry from the 18th century has an estimated value of 2.