Antique Brooch Art Deco .11 Carats of Diamonds in 14k Yellow.  This original Art Deco brooch features diamonds, sapphires, and pearls finished in 14 karat yellow gold. The fine detail upon close inspection of this brooch is amazing. At the center is a .11 carat old European cut diamond and surrounding it are two curved rows of seed pearls and two single cut sapphires. The milgrain detail on the ribbon of gold between the outside border is remarkable.