Most of the ornaments are richly gilt, interspersed with others of silver and niello, and bosses of coloured enamels.
It was of silver, but very beautifully engraved and adorned in Russian niello.
For niello, and printing, a transverse cut was substituted for the blow.
A design thus filled with enamel was called a niello, a derivative of the word nigellum (the most black).
The ground between the ornaments has been cut down, probably for the insertion of niello or enamel colour.
While making a niello, the artist naturally wished to see how the work was progressing and if any alterations were required.
Around this are inscribed two names—Catarina, Nicola—the interstices being filled up with niello.
Both sides of the hoop and each bezel are engraved with interlaced designs inlaid with niello.
The interior of the ears and the lip of the cup have been gilt, and in the nostrils is niello.
Francia, originally a goldsmith, is well known to have been peculiarly skilled in executing larger compositions in niello.