From the beginning, diamond cuts were created based on their natural shape and based on the experience of the masters. Only at the beginning of the twentieth century, in search of an opportunity to improve the transmission of the beauty of a diamond, jewelers began to apply theoretical calculations, taking into account the optical properties, which would provide the stone with the maximum transmission of the light. In 1919, scientists calculated the optically ideal aspect ratio of a diamond, in which an incoming light beam is fully reflected twice from the rear faces on opposite sides and exits the crown,...