LOS ANGELES (CBS SF) — A massive 110-carat diamond is going to be up for auction in December.

Sotheby’s says it’s the largest round diamond ever sold at auction. They expect it will sell for at least $4.2 million.

The big rock is on display in Los Angeles at Sotheby’s Auction House.

Magnificent Jewels & Fine Jewels will auction the diamond in early December.