People visit the Warsaw Mineral Expo in Warsaw, Poland, Oct. 3, 2026. The two-day expo kicked off on Saturday at the Palace of Culture and Science, bringing together nearly 300 exhibitors showcasing minerals, gemstones and jewelry. (Photo by Jaap Arriens/Xinhua)
A visitor picks mineral stones at the Warsaw Mineral Expo in Warsaw, Poland, Oct. 3, 2026. The two-day expo kicked off on Saturday at the Palace of Culture and Science, bringing together nearly 300 exhibitors showcasing minerals, gemstones and jewelry. (Photo by Jaap Arriens/Xinhua)