Udachnaya open-pit mine (Udachnaya-Vostochnaya pipe; Udachnaya pipe), Daldyn, Mirninsky District, Sakha, Russia
Discovered in 1955. As of 2010, Udachnaya pipe is controlled by Russian diamond company Alrosa, which planned to halt open-pit mining in favour of underground mining in 2010.
Gemstone List