LIGHT AMETHYST. THE GEMINI BIRTHSTONE COLOR IS A SYMBOL OF PURITY AND HELPS CALM ANXIETY. Those born in June, or under the star sign of the twins, have Light Amethyst as their birthstone color. Representing purity and childish innocence, gentleness and curiosity, Geminis are expressive, creative, smart and sociable, although sometimes inclined towards nervous anxiety. This cool, silky, and airy color can be used to instill a sense of serenity, grounding them, and providing reassurance.