Sentence:  a young woman named Renata, with a gesturing of her dark curls, beckoned him in with a cigarette-case of Russian silver and <WSD>niello</WSD>, which sprang open to reveal a collection of “smokes” ... 
Meaning of the word marked with <WSD> tags:  Any of various black metal alloys, made of sulphur with copper, silver or lead, used to create decorative designs on other metals.