Before revision: Diptych with Nativity and Adoration, silver and niello, gilt-bronze frame, Paris, c. 1500, The Cloisters Byzantine gold ring with niello inscription "Lord help Leontius, Patrician and Count of imperial Obsikion guarded by God", c. 1000 AD Niello is a black mixture, usually of sulphur, copper, silver, and lead,Ingredients vary; see below used as an inlay on engraved or etched metal, especially silver.
After revision: Diptych with Nativity and Adoration, silver and niello, gilt-bronze frame, Paris, c. 1500, The Cloisters Byzantine gold ring with niello inscription "Lord help Leontius, Patrician and Count of imperial Obsikion guarded by God", Niello is a black mixture, usually of sulphur, copper, silver, and lead,Ingredients vary; see below used as an inlay on engraved or etched metal, especially silver.