Manikya or ruby, the rarest of gemstones, is a red sapphire and often regarded as the king of gems. Rubies vary in colour and brighten in strong light. Some rubies are pinkish red or violet/purplish red in colour, with different colours and shades of colour often found in the same stone.
Manikya or ruby balances Surya (Sun). Surya represents the king of the solar system in Jyotish. It also represents authority, power, Self, father, body and health. Depending on the placement of Surya in your birth chart, the wearing of a ruby may be very auspicious in strengthening the positive influences of Surya.
Surya, the Sun acts like the thalamus in the human physiology. The Sun is the central focal point in the solar system as is the thalamus in our body. All activity in the solar system revolves around the Sun. In our physiology, all activity is controlled and ordered by the thalamus. Enlivening the positive influences of Surya strengthens the physiology and strengthens the qualities of Surya in our daily life.