Depends on what you mean by wealth? There's a difference between having a luxury swimming pool and being able to pull $1000 from your pocket.

Queen Elizabeth II, for example, falls more in the first category than the second. Estimates of her personal fortune don't orbit anywhere near the top billionaires. And some aspects of her lifestyle could be descrbed as "perks.".

Likewise we have to separate titled Romanov wealth from private Romanov wealth, but both ended up with more or less the same fate whether it is known or not: finders keepers, losers weepers.

Imperial Crown Jewels: By order of Tsar Paul I, these belonged to the Russian State, not the Romanov family. Nicholas II had the right to use them, which you could argue was priceless in itself. But the right was limited. He was forbidden from altering items or giving them away. If it says anything about how seriously this was taken, Tsarina Alexandra once complained about the paperwork needed to borrow jewels from the Diamond Chamber, even though it wasn't far away. Most of the jewels were auctioned off in 1927; today, we know where some of them are located, and for some of them we don't.

Imperial Estates: Probably the easiest assets to trace, since they generally don't move (exception: scroll down for information about the Amber Room). I could not find information about the ownership status of the imperial estates during the reign of Nicholas II. What is clear, however, is that he at least had the right to use them as residences until his abdication in 1917. After 1917, the revolutionary government took possession of the estates, eventually converting them over the next few decades into museums or public parks. During World War II the Nazis took possession of the Catherine Palace, whose spectacular Amber Room (yes, an entire room covered wall to wall in gold and amber) has never been seen again. There have been claims that the search is getting hot, but even if it doesn't pan out you can visit the reconstruction.

Faberge Eggs: Private treasures. Only 50 were made; 47 survive in public and private collections, including the Royal Collection which Queen Elizabeth II owns.

Private jewels: Some Romanov items ended up in the possession of the British Royal Family through the grandmother of the current queen, Mary of Teck, who was notorious for it.