Line Bracelet Art Deco Diamond and Platinum Line Bracelet. Side View. Art Deco Diamond and Platinum Line Bracelet. Flat View. A line bracelet is composed of individual, flexible, links which are set with gemstones of the same size. A tennis bracelet is a type of line bracelet. Art Deco Diamond and Platinum Line Bracelet. Side View. Art Deco Diamond and Platinum Line Bracelet. Flat View.