Motifs like ziggurats and sunbursts, stripped of visual clutter, conveyed the optimism of an increasingly technological world. In jewelry, the predominant use of white metals let colorful gems take center stage. Stones that were opaque and true in color, like lapis lazuli, onyx, jade, coral, and opal were worked into designs alongside more precious and brilliant gems, like diamonds, sapphires, rubies, and emeralds. Extra-long beaded necklaces and tasseled “sautoirs” followed the narrow flapper silhouette. The baguette cut was an Art Deco innovation, and the decade saw increased use of other angular diamond cuts, like the precise calibré cut and the emerald cut. Synthetic colored gems, specifically ruby and sapphire, were celebrated as a scientific marvel. Marcel Tolkowsky, 21 years old at the time, published the design for the round brilliant cut in 1919.