In 1907 the brothers opened a new factory at 127 Tolstraat in Amsterdam and soon they received a request from King Edward VII of Great Britain to cleave the legendary Cullinan Diamond, the largest rough gem-quality diamond ever found.
Wells was awarded £3,500 for his find and the diamond was purchased by the Transvaal Colony government for £150,000 and insured for ten times the amount.
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He was born in Pretoria into a significant diamond-mining family (his grandfather, Sir Thomas Cullinan, a diamond mine owner, gave his name to the Cullinan Diamond) and attended Charterhouse School and Oxford University in England (where he read Italian and Russian).