Opal is a gemstone with a color-changing effect. Pliny, a famous natural scientist in ancient Rome, once described it as follows: “Trên một viên đá opal, you can see the flame of ruby, the color spots like amethyst, and the emerald sea. Màu xanh lá, the five colors are colorful, blending together, and beautiful.” Ở Trung Quốc cổ đại, opal […]
