Sapphire:

The magnificent and holy Sapphire, in all its celestial hues, is a stone of wisdom and royalty, of prophecy and Divine favor... And, it's my birthstone. ;-)

In Hebrew lore, King Solomon and Abraham both wore talismans of Sapphire, and the Law given to Moses on the Mount was said to be engraved on tablets of Sapphire. The Greeks wore it for wisdom at Delphi when seeking answers from the Oracle at Apollo’s Shrine. Buddhists believed it brought devotion and spiritual enlightenment, and the Hindus considered Sapphire as one of the “great gems” used in offerings in the temples for worship and to align astrological influences. In Christianity it was used in ecclesiastical rings, and was cherished by kings and nobility for its powers of protection and insight.

Today, it is still known as the "wisdom stone", each color of Sapphire brings its own particular wisdom. I of course will always be partial to blue which stimulates the Throat and Third Eye Chakras, allowing one to access deeper levels of consciousness.

Sapphire also releases mental tension, depression, unwanted thoughts and spiritual confusion.It restores balance within the body, aligning the physical, mental and spiritual planes, bringing serenity and peace of mind.  It is a royal stone of learning, mental acuity and psychic activation, a seeker after spiritual truth. Its pure Blue Ray brings order and healing to the mind, lending strength and focus, and an ability to see beneath surface appearances to underlying truths and to utilize that knowledge.