Silvered Glass Roman Glass This is a necklace approximately 2.4cm in size. It cost around 16,000 yen at the time of purchase, but I think the color has become even more vibrant since then. Roman glass refers to all glass products made within the Roman Empire during the Roman era. Glass made about 2,000 years ago, while buried in the earth for a long time, became silvered and shines with a rainbow color like this. The color changes depending on the angle, so please try observing it from various angles. Natural Stone Color Stone Diamond Ruby Emerald Sapphire Opal Citrine Lapis Lazuli Amethyst Tourmaline Alexandrite Sphene Iolite Pearl Opal Pigeon Blood