Approximately 23mm x 22mm. A large, captivating dumortierite in quartz, like a clear seabed! You could stare at it forever. 18k gold top. Chain not included. We have been a rare stone & jade specialty store in Ginza Five for 10 years (*^^*) Also on sale in our store! Please comment before purchasing. Reduced from 250,000 yen to 198,000 yen!