Nephrite as a surface treatment. A lot of nephrite tools and amulets are known since the Early Neolithic (VII mill. BC) to the Late Chalcolithic (V mill. BC) on the Balkans (mainly Bulgaria; also in Greece, Serbia, Croatia) from two or more unknown sources - Balkan "nephrite culture". Such tools are found in the Later Neolithic of Poland (from the most probable local source Jordanów), Sardinia (Italy) (unknown source) and Switzerland (Kostov, 2005; 2013). Single or just a few finds of nephrite artifacts are reported also from some other European countries. During Neolithic times, the key known sources of nephrite jade
Empire Nephrite (Fabergé egg) by a specially commissioned group of experts, a unique historical document was found – the "List of the personal property of the Dowager Empress Maria Feodorovna, located in storage at Gatchina Palace" by 28 July 1917. This 12-page booklet mentions at least 150 items, including 7 Imperial Fabergé eggs that belonged to the Dowager Empress Maria Feodorovna. On the second page of this document, as number 10, there is a description "Egg with gold mounts, on two nephrite columns, with portraits of Gr. Dss. Olga Alexandrovna and Duke P.A. Oldenburg inside". This description is the most accurate that Fabergé researchers