Answer: niellist

AnswerCrossword Clue
NIELLISTOrnamenter of metal with inlays.
NIELLISTWorker with black alloy on metal
niellistone who does nielloing
niellistornamental work so produced
niellistto decorate by means of niello; treat with niello or by the niello process
niellistblack metallic substance, consisting of silver, copper, lead, and sulfur, with which an incised design or ground is filled to decorate metal