Mother of pearl (MOP) is an iridescent layer of material which forms the shell lining of many mollusks. Pearl oysters and abalone are both sources of mother of pearl, which is widely used as an inlay in jewelry, furniture, and musical instruments. Mother of pearl comes in several natural colors, and is often bleached and dyed for decorative use. Sanwa offers MOP in various quality, shapes, sizes and colors. (Representations of colors are approximate, due to the limitations of photographic and discrepancy of different computer monitor.)