Enameling is the technique used to cover metal with coloured glass in order to produce stunning pieces of jewellery and decorative items. The glass, which is usually used in a powdered form, is fused to the metal by heat to form a strong bond between the two materials. Cloisonné : This technique involves mapping out the design on a metal base with thin copper, gold or silver wire. The enamel is then placed around this framework and held in place by soldering or firing. The firing process is slightly more complex as it involves the piece being fired three times before the design is complete.