It is the colour of the Ajna Chakra which controls the Pineal gland. It is
also the colour of Vitamin K. It is electric, cooling and astringent. It
is a Para Thyroid stimulant; a Thyroid depressant. It purifies the blood.
It helps reduce or stops excessive bleeding.

Its gland is the pituitary, which is the most complex of the glandular
system producing hormones that control many functions throughout the body.

Indigo can be effective as an anesthetic and can induce total
insensibility. If the patient stares at Indigo colour for a particular
time, it seems to raise his consciousness to a high level of vibration.

Indigo is the most powerful pain killer in the spectrum.

The gems which emit Indigo rays are Azurite, Indigo and Sapphire.