Chelsea football club owner and superyacht enthusiast Roman Abramovich slipped out of the top 10 richest Russians in Forbes magazine's 2013 ranking.
The tycoon has lost $1.9 billion (£1.2 billion) of his fortune and is now worth $10.2 billion, putting him in 13th place, the Forbes list said. It did not explain the fall in wealth.
It did note that he has a $1 billion art collection, and that he bought 40 works by top conceptualist artist Ilya Kabakov for $60 million earlier this year.
Abramovich is noted for having one of the world's largest yachts that he uses to travel the world, and which recently docked in New York for the birth of his son.
Eclipse, the world's largest private yacht at 163.5m (536 ft), owned by Russian billionaire Roman Abramovich, docked on the Hudson River in New York City (LFI/Photoshot).
The richest Russian, according to the Forbes, is Alisher Usmanov, an Uzbek-born Russian tycoon whose $17.6 billion fortune comes from original investments in mining, which have since expanded into media and other interests. He heads the list for the second-year running.
Usmanov was ranked as the 34th-richest person in the world by Forbes, while Russia's number two Mikhail Fridman, a former co-owner of the TNK-BP (LSE: BP.L - news) oil company, was ranked 41st worldwide with $16.5 billion in wealth.
The top five was rounded out by the $15.4 billion of Leonid Mikhelson, a major stakeholder in the Novatek natural gas company (ranked 47th in the world); the $15.1 billion of Viktor Vekselberg, another former TNK-BP co-owner (ranked 52nd in the world); and the $14.8 billion of Vagit Alekperov, president of Russia's number two oil producer Lukoil (ranked 55th in the world).