"Cameo glass is a luxury form of glass art produced by cameo etching and carving through fused layers of differently colored glass to produce designs, usually ...
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with white opaque glass figures and motifs on a dark-colored background. The technique is first seen in ancient Roman art of about 30 BC, where it was an alternative to the more luxurious engraved gem vessels in cameo style that used naturally layered semi-precious gemstones such as onyx and agate. Glass allowed consistent and predictable colored layers, even for round objects.
From the mid-19th century there was a revival of cameo glass, suited equally to Neo-Grec taste and the French Art Nouveau practiced by Émile Gallé. Cameo glass is still produced today." - (en.wikipedia.org 08.03.2020)
