"Valerio Belli (c. 1468 – 1546), also known as Valerio Vicentino, was a celebrated medallist, gem engraver,goldsmith, who with Giovanni Bernardi, who was twenty years younger, ...
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was the leading specialist in intaglios engraved in rock crystal, a difficult luxury form which Belli pioneered. These were highly sought after by wealthy Italian collectors. Though described as being "engraved", the intaglios are cut by drills, sometimes quite deeply, and developed their style from classical coins and engraved gems, to give "smoothly and eloquently orchestrated figural compositions". Castings of many of the crystal carvings were taken in wax and them used to make metal plaquettes, which Belli also designed and made de novo. He was described as a goldsmith, though no surviving works are known, and had some role at the Papal mint, though no coins are clearly attributable to him." - (en.wikipedia.org 12.12.2019)
