Art Deco Pearl, Emerald and Diamond Collier De Chien Choker Necklace circa 1926. The central plaque set with a rectangular emerald surrounded by diamonds, mounted on to seven rows of Akoya pearls, mounted in gold and platinum. Akoya pearls are the specialty of Japanese pearl farms. The first pearls to be cultured early in the 1920s, their white color and rosé overtone complement a fair complexion. Because Akoya pearls are a high-quality pearl, you’ll find them set with gold posts and clasps, and you’ll find they are well matched for size, shape, and color. You’ll also find few blemishes and a deep, beautiful luster.