The World's largest Rough Diamond Laurence Graff Diamond holding the world largest rough diamond Graff Diamond, a British jeweler based in London has acquired the world hugest piece of diamond. Following successful negotiation with Lucara Diamond Corp, Laurence Graff has acquired the world’s most valuable rough diamond – the Lesedi La Rona – weighing a record-breaking 1,109 carats. The deal was closed with a handshake after more than a year of negotiations. Discovered at the Lucara Karowe mine in north-central Botswana, the hypnotic Lesedi La Rona is the largest gem quality rough diamond discovered in over 100 years. This magnificent stone has been identified by the Gemological Institute of America as possessing exceptional quality and transparency, earning the full significance of its name, which means ‘our light’ in Botswana’s Tswana language. Source: https://www.graffdiamonds.com/