Ruby is considered to be the most powerful gem in the universe. The color of rubies varies from vermilion to red. Ruby works with the flow of blood as an aid to circulation. It aids the cleansing and removal of infection or germs in the blood. Ruby is a symbol of power, vitality, royalty, friendship and love. It also gives the courage to be best potential that a person has. Ruby gives courage and protection. It is said that rubies set in rings should be worn on the left hand for protection, and to provide the wearer with the energy to make good and wise decisions.