1) Screen shot, informational film Alrosa website, http://eng.alrosa.ru/operations/diamond-production/
2) Diamond surface as seen through stereoscopic microscope, photographer Wolframeister, https://commons.wikimedia.org/wiki/File:Diamond_face_II.jpg
3) Diamond macle, source Robert M. Lavinsky, https://commons.wikimedia.org/wiki/File:Diamond-diamond_macle2.jpg
4) Diamond crystals, https://rabotayouth.ru/en/kak-dobyvayut-almazy---kimberlitovye-trubki-samyibolshoi.html
Diamonds are very, very old. In Siberia estimates are that they formed 2 billion years ago. They came to the surface of the earth through ancient volcanic explosions, and are some of the only materials that carry information about the earth's molten mantel. Their strength comes from carbon atoms linking together in a lattice structure, creating the characteristic facets. I always think it's a great pity to cut and polish them, as they are so ancient, and so beautiful in the rough.