Let us recall that from the Middle Ages to the 17th century, doctors were also chemists, alchemists and astrologers. They left us their writings on their "miracle" remedies. The theory of signatures was then used: red stones were supposed to cure blood diseases, yellow stones, liver diseases... You see that there are different approaches, it is up to each person to find their own: energetic, scientific or even... magical! Stones make our lives easier and have a power over our daily lives!