What is enamel, you say?
Raïssa sez: Enamel is a material made by fusing powdered glass to a substrate by firing, usually between1380 and 1560 degrees Fahrenheit. The powder melts, flows,and then hardens to a smooth, durable vitreous coating on metal. The fired enameled ware is a fully laminated composite of glass and metal. The word enamel comes from the High German word smelzan (to smelt). Enameling is an old and widely-adopted technology, for most of its history mainly used in jewelry and decorative art, but since the 19th century applied to many industrial uses and in everyday day consumer objects.
Antique Rene Lalique enamel, peridot, and gold ring.