Ruby is said to be most effective when worn on the ring finger of the active hand. This means the right hand for right-handed people and the left hand for left-handed people.
Finger:
The ring finger is associated with the planet Venus, which rules love, beauty, and luxury. Wearing a ruby ring on this finger is said to enhance these qualities and bring good fortune in matters of the heart.
It's important to note that these are traditional beliefs and there is no scientific evidence to support the idea that wearing a ruby ring on a specific finger can bring good luck or influence personal qualities.