While the ancient Romans liked transparent crystals, especially emeralds and beryls, they were not the most valued gems.
The most valued gems in Ancient Rome were the higher-quality varieties of noble opals and pearls, which are not transparent, but which show a variable play of colors, depending on the ambient light and on the angle of sight.
The most valued gems in Ancient Rome were the higher-quality varieties of noble opals and pearls, which are not transparent, but which show a variable play of colors, depending on the ambient light and on the angle of sight.