This book is dedicated to the history of the only opal mines in Europe and the oldest place in the world where this colourful gem was regularly mined. The Author will take you for a trip and through six main chapters will acquaint you with a fascinating story which originated in the heart of the northern part of the Slanské vrchy Mountains. But there is more behind because the region where European precious opal was mined was not a prominent or a wealthy one with a ready market for such treasure and thus all the mined gems were very quickly sent around the whole world.