Emerald
Its name comes from the ancient Greek word for the color green, "smaragdus". Its tone varies and is determined by its chemical composition, among which we find chromium, iron or vanadium. It is often said that emeralds favor those couples who want a quiet life together. It is also associated with increased money flow or the cure of heart problems, asthma and insomnia.
Color: Green
Associated month: May
Moh's hardness: 7.5 to 8
Ethical origin: Brazil, Sri Lanka, Tanzania, Namibia, Afghanistan...