This stone is used for the planet, the Sun. This stone is used for the planet, the Sun. The Sun represents the heart, digestive system, circulatory system of the body, one's father, one's social status and one's relationship with the Government. If the Sun is weak in the birth chart then one suffers on account of the foregoing significations, then using the stone Ruby protects and promotes the significations. The recommended weight of the Ruby is between 4.6 to 4.7 carats. The stones used should be flawless, bright and should not contain feathers and silky inclusions.