The largest round fancy intense pink diamond to ever appear at auction sold for $17.4 million at Christie’s Hong Kong Magnificent Jewels sale Tuesday, May 29, Forbes reported.

Known as the “Martian Pink” the extremely rare diamond was owned by a private collector.

It was purchased from Harry Winston in 1976—the same year, the United States launched its first satellite on a mission to Mars: The Viking Landers. Ronald Winston named the diamond to honor the historic event. It sold for approximately $1.5 million per carat. Its estimate was $8.4 million to $12.3 million. The diamond is mounted on a size-7, 18k gold ring.