Opal is a gemstone with a color-changing effect. Pliny, a famous natural scientist in ancient Rome, once described it as follows: “บนหินโอปอล, you can see the flame of ruby, the color spots like amethyst, and the emerald sea. สีเขียว, the five colors are colorful, blending together, and beautiful.” ในประเทศจีนโบราณ, โอปอล […]
