The Birthstone of Sagittarius is the Lapis Lazuli. Lapis Lazuli is one of the birthstones of this global thinker. Lapis is a stone for the third eye and deepens the connection to your own inner wisdom, intuition and truth. It is an opaque blue stone with the magical power of the earth to help manifest those creative impulses and insights into something tangible. Lapis was one of the sacred stones used in abundance in Egyptian jewelry in combination with gold and coral.
Venus Square to Mars. Venus, the goddess of love, harmony and beauty is fighting with her lover Mars over their very different point of views. Venus is in Scorpio and wants deep commitment and honesty. Mars is in playful Leo and likes to play, seduce and tempt the goddess. Men are from Mars and women are from Venus and they are often very different if their perspectives, needs and desires. I always thought that book from John Gray was genius in playing on the deep archetypes we all have in us.
It is not a very expensive stone and is made into necklaces or bigger pieces for jewelry purposes. I especially like the deep, dark blue version with golden pyrite sprinkles creating very unique patterns mined only in Afghanistan. The lighter blue, grayish variety is found in Chile.