什么母亲珍珠?

母亲珍珠, 另 known 作为珍珠层, organic 材质生产内部母贝.其不 known exactly 什么 elements causes 其 formation.
母贝 secrete 其作为 defense mechanism 依据 foreign agents, 诸如作为 grains sand.

其应 remembered 珍珠层不 same 作为珍珠.珍珠 organic 宝石 composed layers 珍珠层, usually adopts 正圆形.

uses 母亲--珍珠 varied, 两者适合 decorative elements 与适合首饰或 watches.Traditionally, 母亲--珍珠 spoons 已制造 eat caviar.