核化された真珠は2つの部分に分かれています, 核とナーレ, 内側から外側まで. 最も内側の層は核です. The nacre is a crystal of keratin and calcium carbonate formed on the surface of the pearl nucleus or foreign body by the secretions of the pearl oyster during cultivation or […]
核化された真珠は2つの部分に分かれています, 核とナーレ, 内側から外側まで. 最も内側の層は核です. The nacre is a crystal of keratin and calcium carbonate formed on the surface of the pearl nucleus or foreign body by the secretions of the pearl oyster during cultivation or […]