Emeralds can range in color from bluish-green to a deep green. They are generally very included gemstones and high quality emeralds are very rare, causing them to be very valuable.
Legend states that emeralds could improve your memory and increase intelligence. Emeralds were also believed to be an antidote for poisons and poisonous wounds. Unfortunately this did not work as an antidote for Cleopatra. She owned an emerald mine and is believed to have died from a snake bite.
Emeralds rate 7.5-8-0 on the Mohs scale. It is best to avoid contact with other gemstones. Emeralds can be cleaned with warm soapy water and a soft-bristled brush. Do not use ultrasonic or steam cleaners.