8x 5 x 5mm. These are natural coral cabochons. The shape of these cabochons is oval and they are high domes. Because these are 100% natural coral, the color of these cabochons will vary slightly, no two are exactly alike. We thought these coral cabochons were so pretty that we had them set in sterling silver box clasps. FYI - There are very strict rules set in place regarding the importation of coral into the United States. International law protects the rarest and endangered coral in all parts of the world. Many varieties of coral are considered sustainable and in reality they grow faster when they are being harvested. These are natural coral cabochons! As with any natural cabochon, please expect slight imperfections in size, shape and color.