Laurence Graff and his son Francois are ranked 44th in the newly-published Sunday Times Rich List 2025 of Britain’s 350 wealthiest individuals.
Their worth is estimated at £3.65bn ($4.85bn), up £50m ($66m) on last year’s figure.
Laurence Graff founded the iconic Graff Diamonds in 1960 and remains chairman, aged 86. Francois, who has been involved in the family business for over 35 years, now serves as CEO.
Also in the Rich List, at number 342, is Alisa Moussaieff and family, with an estimated £342m ($454m) worth.
She is the CEO and creative director of the exclusive Moussaieff Jewellers, founded by her late husband Shlomo in 1963.
Top of the list is Gopi Hinduja and family. He chairs the Hinduja Group, a multinational conglomerate spanning automotive, oil and speciality chemicals, banking and finance, IT, cybersecurity, healthcare, trading, infrastructure project development, media and entertainment, power, and real estate, valued at £35.3bn ($46.9bn).
King Charles II is at 238, with £640m ($851m).
Source: IDEX