Dear Galina,
I agree with you completely about the idea of setting up the Museum in Faberge's old shop on Bolshaya Morskaya -- however, I must say that the idea for the museum had nothing to do with Dr. Piotrovskii. The idea for the Faberge museum was created by the US-Russian joint venture the "Faberge Arts Foundation: which has offices in Washington DC, St. Petersburg, and now Moscow.
www.fabergearts.orgIn fact, Piotrovskii has opposed the Faberge Museum, because part of the goal is to concentrate the various undisplayed state collections (for example, Pavlovsk has a large collection formerly in the ALexander Palace which is not displayed, and Gatchina, Peterhof, and the Catherine Palace have objects which aren't diplayed anywhere either. The Fersman Minerological Institute has a big collection as well.), and Piotrovskii's goal is to have all those collections at the Hermitage. The FAF also wants to turn Faberge's dacha (at Levashovo?) into a Jeweler's Research Center.
Things may have changed at this point. It has been years since I heard anything about the Faberge Museum idea.
On the topic of Romanov jewelery, I know of a suite of Diamonds and Aquamarines made for ELizaveta Feodorovna made by Faberge is in the US, and one of the Imperial tiaras from the nineteenth century is in that hands of an English Duchess.
Best,
Nick