September – Sapphire

Attributes

Sapphire is known as the wisdom stone, each color having its own particular wisdom. It focuses and calms the mind and releases unwanted thoughts and mental tension. Bringing in peace of mind and serenity, Sapphire aligns the physical, mental, and spiritual planes and restores balance within the body.

Zodiac stone & Day stone

Sapphire is the gemstone for Taurus, and also day stone for Thursday.

Stone information from

The Crystal Bible, Edited by Judy Hall, ISBN 1-58297-240-0
https://en.wikipedia.org/wiki/Birthstone#cite_note-10