The Sefadu

The Sefadu  is an uncut diamond weighing 620 carat which easily makes it one of the worlds’ largest diamonds.

It’s owned by leading diamond manufacturer Lazare Kaplan- its current whereabouts is unknown. It is one of the largest rough stone ever found, and the only one of the top stones never 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.

In 1919, Lazare Kaplan’s cousin, mathematician Marcel Tolkowsky, first published the mathematical formula for diamonds cut to “ideal” proportions, a formula designed to optimise the brilliance, fire and sparkle in a polished diamond.The Tolkowsky Connection…amongst others

In the same year, Lazare Kaplan became the first commercial-scale operation to cut its diamonds to ideal proportions.

In 1957, Lazare Kaplan developed the modern oval cut, and in 1983 it developed and patented the laser inscription process. In 2002, Lazare Kaplan was awarded a patent, jointly with the General Electric Company, for the high-pressure high-temperature (HPHT) process for improving the color of certain all-natural diamond types.

In addition, Lazare Kaplan has secured numerous patents on diamond setting techniques and innovations in displays for loose polished stones and jewelry.

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