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) some Fabergé researchers were of the mistaken opinion that this egg featured a portrait medallion of Alexander III of Russia, though the original bill did not refer to a portrait of Alexander III. This mistake was result of a misinterpretation of the Moscow Armory Chamber valuables selection list. This list noted an "Egg from nephrite, on a golden base, and with portrait of the Emperor Alexander III in a medallion". Because of this, many researchers were certain that the 1902 Imperial egg featured an Alexander III portrait, though there is no evidence to support this. However, in 2015, during research