Aventurine glass is a process invented in Murano around 1620. The first recipe to create aventurine is found in a manuscript by Giovanni Darduin of 1644, although already in a letter of 1614 it speaks of “a kind of stone with golden stars inside”, from which also its further name of “stellaria” (from “Types of glass and glassmaking techniques in the nineteenth century”, Museo del Vetro, Venice). The aventurine glass assumes, probably, the name also from the circumstance for which its difficult realization is to be considered a real “adventure”. It is a brown-colored glass paste that comes in the form of blocks. Inside it is immersed brilliant specks of copper with brilliant metal oxides that create an effect similar to that of aventurine quartz. The processing, very complex and long, ends with the precipitation of the metallic copper which is thus completely separated from the base glass, dispersing itself in very minute crystals which tend to give the material a brown-red shimmer with golden reflections. It is still used by the “perlere” (the producers of pearls), ground in crushers of various thicknesses called “pestaccio” or “spolvero” or pulled into “peaks”, of thin metal wires used for decorations.