The Sefadu is an uncut diamond weighing 620 carats which easily makes it one of the worlds’ largest diamonds. It's owned by Lazare Kaplan, and American diamond company, but its current place is unknown. It is one of the largest rough stone ever found, and the only one of the top stones not to have been cut.
Ever since the discovery of the 620 carat Sefadu diamond in 1970, and the 968 carat Star of Sierra Leone diamond at the Diminco Mine in 1972, mining companies have been planning to start major exploration programs of Sierra Leone's primary kimberlite deposits.
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