Just before the 1920s, Art Nouveau styles gave way to Art Deco. The Art Deco movement lasted from about 1915 to 1935 and was influenced by the styles and taste of the Jazz Age.
During this time, women were rebelling against the social restraints leftover from the Victorian era, and this was reflected in their choice of jewelry. Art Deco jewelry was characterized by sharp lines and geometric shapes, unlike the delicate, feminine styles of the Victorian era.
Art Deco jewelry was influenced by trends in fine art, such as the Cubist and Futurist movements. It was also part of the Egyptian Revival movement, and many Art Deco pieces imitated the lines and shapes of Egyptian artwork.
Large, eye catching jewelry was in style, and sets of earrings, necklaces, and rings were often made to match. Diamond engagement rings were popular during the Art Deco movement, but brighter gemstones were also common. Jewelry was set with emeralds, rubies, and sapphires, or simply made of elaborate metalwork with no gemstones at all.
Industrialization heavily influenced the Art Deco movement, with machines being widely used to cut gemstones for the first time. Machine cutting led to the advent of the round brilliant-cut diamond, which became instantly popular for engagement rings. New casting techniques were also used for metalwork, allowing settings for rings and earrings to become more elaborate than ever.