De Grisogono is a Swiss luxury jeweller. It was founded in Geneva, Switzerland, in 1993 by black diamond specialist Fawaz Gruosi. In 2017 the company set a new record at Christie’s Magnificent Jewels sale in Geneva when it sold the world’s biggest-ever emerald cut diamond offered at auction : The 163.41-carat D Flawless stone, which was cut from a 404 carat rough, was incorporated into a necklace designed by Fawaz Gruosi. It fetched 33.5 million Swiss francs !
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