Weight: 5.528 g Price: $ 16 Million Originating from a diamond mine in South Africa, The Heart of Eternity is rated as being Fancy Vivid Blue, one of the rarest colors of diamonds out there.

It is insured for $250 million. Heart of Eternity: A South African 27.64 carat diamond unveiled in 2000. Its value is estimated at $16 million but its owner is unknown ...

The other 11 rare blue diamonds, including the vivid blue 27.64-carat Heart of Eternity, came from the De Beers Premier Mine near Pretoria, South Africa. Harry Oppenheimer, De Beers' retired chairman, ...

Livnat says, "The Heart of Eternity, was sold to a private collector who gave it to his wife for her 50th birthday." It's shaped like a heart. Livnat adds, "The largest vivid blue diamond ever." ...

Only a few bigger blue diamonds exist, including the "Heart of Eternity," valued at $16 million, and the 45-carat "Hope" worth an estimated $350 million despite having a reputation as being cursed.