Opal is a gemstone with a color-changing effect. Pliny, a famous natural scientist in ancient Rome, once described it as follows: “Na opalowym kamieniu, widać płomień rubinu, plamy koloru przypominające ametyst, and the emerald sea. Zielony, the five colors are colorful, blending together, and beautiful.” W starożytnych Chinach, opal […]
