Asparagus and Mint Green Center Drill Button Freshwater Pearls measure approximately 5mm average diameter in size, have an excellent near metallic luster, excellent smooth nacre quality, excellent matching of shape and quality on strand, the button shaped pearls have been center drilled, and these freshwater pearls are a stable color treated medium Asparagus green and medium Minty Green hue on a silver body with a slightly iridescent overtone.