The History, Significance, Healing Properties, Advantages, and Applications of Green Kyanite Anyone born under the signs of Aquarius or Capricorn is thought to benefit greatly from the spiritual meaning of green kyanite crystal, which is thought to improve insight, stimulate personal growth, foster a sense of understanding, and significantly improve lifestyle. Furthermore, the holistic strength and glitzy allure of green gem jewels in the form of birthstone jewelry are bestowed onto those whose birthdays fall between April 19 and May 20.