During his singing career, Mario and Grisi both accumulated a significant fortune, particularly at their assignments at the Mariinsky Theatre where the Tsar used to pay them in gold coins. During their extensive tours in France and England they were paid handsomely in the currency of the time. They had also accumulated a great deal of jewelry—diamonds and other precious stones—as gifts from admiring kings and queens of Europe. Their joint fortune was estimated to be over 600 gold-bars, equivalent to 12 million US dollars in today's currency. They owned a home near L'Opéra in Paris, a mansion in Fulham, London, and the Villa Salviatino near Florence, as well as a cottage for Mario's mother in Cagliari. Mario's finances were entrusted to the Rothschild & Cie Banque in Paris, France, and eventually transferred to N M Rothschild & Sons in London, England.