Cameo is a method of carving; or an item of jewelry made in this manner.
A cameo is usually made of two types of material, commonly precious or semi-precious stone. One material is carved into a figure-- the most common type being a profile portrait of a person's head. This is then set upon the other type of material which provides a background of another colour to set off the figure. Cameos are often worn as jewelry. Cameos of great artistry were made in Greece dating back as far as the 6th century BC. Cameos were very popular in Ancient Rome and have enjoyed periodic revivals, notably in the early Renaissance, and again in the 17th and 18th centuries.
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