Sterling silver « Niello » cup with cover. Moscow, Circa 1838
 
Tasse et couvercle en argent massif et niellage, Moscou, Circa 1838
 
Niellois a black mixture of copper, silver, and lead sulphides, used as an inlay on engraved or etched metal. It can be used for filling in designs cut from metal. The Egyptians are credited with originating niello decoration, which spread throughout Europe during the late Iron Age and is common in Anglo-Saxon, Celtic and other types of Early Medieval jewellery.