Blacklip shells, also known as pearl oysters, have greyish green with white or yellowish radial rows of scales. Internally, the blacklip shell is very pearly with a pale blue or violet cast and reddish to black markings. The best pearls are produced by this shell. So, if you love the classic elegance of pearls on your jewelry designs, you can easily create a look that's relaxed yet elegant with these blacklip shell beads and pendants.