5.5mm Round White Japanese Cultured Akoya Pearl, Very Good Quality. These pearl strands display the near perfect roundness that Japanese Cultured Akoya Pearl strands are famous for. These pearl strands are 15.5-16 inches in length, and width of the pearls are between 5.5mm and 6.0mm. Some individual pieces may be slightly larger or smaller, but we try to keep it as close as possible when selecting your strands. . These pearls are perfect for designer projects items because they give you the best value for quality. The cultured akoya pearls used in these strands have few flaws and are very uniform in color hue. They also have very good luster.