Each starsign has unique characteristics which can be developed and enhanced by using the correct crystal. As a starsign has so many unique traits, only one birthstone would not work. I have listed a few stones for each star sign. These listed crystals will work wonderfully for the specific sign.
Capricorn- December 22nd - January 20th
Moss Agate, Agate, Tourmaline, Malachite, Onyx, Snowflake Obsidian
Aquarius - January 21-Feb 19th
Turquoise, Aquamarine, Labradorite, Fluorite, Malachite, Agate
Pisces February 20th to March 20th
Amethyst, Fluorite, Sugilite
Aries March 21st to April 20th
Ruby, Carnelian, Jasper, Kyanite
Taurus April 21st to May 20th
Rhodochrosite, Rose Quartz, Agate, Aventurine, Zircon
Gemini May 21st to june 21st
Amber, Citrine, Carnelian, , Celestite, Aquamarine, Black Onyx
Cancer June 22nd to July 22nd
Emerald, Moonstone, Aventurine, Jade, Chrysoprase, Chrysocolla
Leo July 23rd to August 23rd
Rock Crystal, Diamond, Topaz, Selenite
Virgo August 24th to September 23rd
Tigers Eye, Jasper, Citrine, Carnelian, Ametrine
Libra - September 24th to October 23rd
Smoky Quartz, Aquamarine, Sugilite, Tourmaline, Green Aventurine
Scorpio - October 24th to November 22nd
Hematite, Coral, Fluorite, Obsidian, Sard, Spinel, Tourmaline, Garnet, Rhodonite
Saggitarius - November 23rd to December 21st
Lapis Lazuli, Obsidian, Aventurine, Herkimer Diamond, Sodalite










