Certain Crystals have more vibration power at certain times of the year.
The most important point when using any Crystal... is to keep it within your aura. Keeping the vibration of Crystals with you for as long as possible each day... may help you to create a good healing outcome, this applies to your Birthstone Crystals as well.
Taurus April 20 to May 20 Rose Quartz, Aquamarine, Carnelian, Rhodonite, Tigers Eye, Selenite
Gemini May 21 to June 20 Aquamarine, Citrine, Hematite, Tigers Eye, Rainbow Moonstone,
Cancer June 21 to July 22 Carnelian, Rhodonite, Rainbow Moonstone,
Leo July 23 to August 22 Carnelian, Citrine, Larimar, Garnet, Sunstone
Virgo August 23 to September 22 Citrine, Amazonite, Garnet, Peridot, Rainbow Moonstone, Sodalite
Libra September 23 to October 22 Aquamarine, Bloodstone, Aventurine, Lapis Lazuli, Rainbow Moonstone, Sunstone, Peridot, Prehnite
Scorpio October 23 to November 21 Lapis Lazuli, Malachite, Rainbow Moonstone, Black Obsidian, Peridot
Sagittarius November 22 to December 21 Azurite, Blue Lace Agate, Malachite, Labradorite, Snowflake Obsidian, Sodalite
Capricorn December 22 to January 19 Azurite, Black Tourmaline, Garnet, Fluorite, Carnelian, Malachite, Labradorite, Smokey Quartz, Black Onyx
Aquarius January 20 to February 18 Aquamarine, Iolite, Angelite, Labradorite, Fluorite,Rainbow Moonstone
Pisces February 19 to March 20 Aquamarine, Fluorite, Blue Lace Agate, Calcite, Sunstone, Bloodstone, Labradorite, Amber, Rainbow Moonstone