Nanometer pearl powder refers to pearl powder with average particle size less than 100 nanometers.The diameter of nanometer pearl powder was determined by TEM.Pearl powder is a powdery substance made from pearls produced by Hyriopsis cumingii (Lea), Cristaria plicata(Leach), Pteria Martensii (Dunker) and other shellfish.White or white, with a special fishy taste of pearl.