Opal is a gemstone with a color-changing effect. Pliny, a famous natural scientist in ancient Rome, once described it as follows: “Σε μια πέτρα οπάλιο, you can see the flame of ruby, τα χρώματα σαν αμέθυστος, and the emerald sea. Πράσινος, the five colors are colorful, blending together, and beautiful.” Στην αρχαία Κίνα, οπάλιο […]
