A ruby ring is a traditional gift for a 40th wedding anniversary. For as long as people have treasured gemstones, rubies have been associated with power and emotion. They are the same colour as the blood that flows in our veins, and were always believed to hold the power of life. Its colour gave rise to a belief that an inextinguishable flame burned in the stone, and that this flame could not be hidden and would shine through any material wrapped around the stone.
Red is also the colour of desire, and rubies were thought to be able to remove evil thoughts, control amorous desires(!) and reconcile disputes.