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Named after the French word for "raised field", champlevé enamelling is an ancient technique designed to add colour and lustre to metal jewellery - in which troughs are sunk into the surface of a metal object, filled with vitreous enamel and fired.
Enamel can be transparent, opaque or translucent, while a wide range of different colours and hues may be added to the smelted glass by mixing it with various minerals, like the metal oxides cobalt, iron, neodymium, praseodymium and others.
Among the most famous jewellery-makers are Fabergé of Russia, Tiffany & Co of New York and René Lalique and Cartier of Paris.
One of the most expensive types of art, the basic components of jewellery include metal sheet, metal cast in a mold, and wire.
Another related embossing technique is known as Chasing.
This is the opposite technique to repousse, in that while repousse works on the reverse of the metallic sheet to create a raised pattern on the front, chasing is used to create designs on the front of the sheet by sinking the surface of the metal.