Have you ever found a beautiful pebble on the seashore? It may have been semi-precious. The Koktebel beach at the foot of Karadag once was famous for the most beautiful gems in Crimea. But this fame played a cruel joke on it. In preparing the video, materials from the book by geologist Yuri Polkanov «Minerals of Crimea» and the article by journalist Natalya Dryomova «Ancient Volcano. What treasures are hidden in the Karadag mountain range in the Crimea” were used.