Named in the 14th century, this green form of beryl takes its colour from the presence of chrome in the stone. It is probably the most valuable of all precious stones. Known from as early as 2,000 BC, the emerald was very popular with the ancient Egyptians. It was named the fourth foundation stone in the wall of the new Jerusalem. It was said to heal inflammation, was used as an antiseptic and even used to cure major infections such as the plague, by rubbing the stone on a sore. The jewel of Venus, Roman goddess of love and beauty, emerald is known as a stone of successful loveù and is said to promote domestic bliss and to instil both sensitivity and loyalty in oneself as well as in others. It aids fertility, growth, honesty and self-discovery and is thought to be helpful if you are feeling vulnerable in a relationship. The emerald is said to solve complex problems by stimulating the brain and memory. It is considered to be an antidote for poison and to heal diseases of the eye and improve eyesight as well as being good for bones and teeth. Emerald is used as a cure-all, strengthening the heart, liver, kidneys and immune system and vitalising and toning the body and mind. It can be used to improve memory and to stimulate the use of greater mental capacity. Emerald is the birthstone for May, symbolising love and success, and the zodiac gem for Cancer (22 June to 22 July).