The article dedicates to the analyze of the project graphic of Ekaterinburg lapidary factory of the second half of the 19th - beginning of the 20th century and to the problem of the authorship of the hard stone art pieces made in Ural. One specific example was studied about the reflection of the style evolution, the methodology of the transformation of the old fashion’ projects. For the first time the article proposes the archive documents-based attribution of the previously nonidentified piece by the imperial lapidary factory.