Were both Stuart Paton and Ivan Perestiani  Russian film directors?
Ivan Perestiani Ivan Nikolaevich Perestiani (also Ivane, Georgian: ივანე პერესტიანი ; Russian: Иван Николаевич Перестиани ; 13 April [O.S. 1 April] 1870 — 14 May 1959) was a Russian/Soviet film director, script-writer and actor, and People's Artist of the Georgian SSR (1949). He was of Kefalonian Greek descent.
The Hope Diamond Mystery The Hope Diamond Mystery is a 1921 American action film serial directed by Stuart Paton and featuring Boris Karloff. The film survives with a copy at the Library of Congress.