Month	Modern Birthstone	Alternate	Traditional Birthstone
January	Garnet	Rose Quartz	Garnet
February	Amethyst	Onyx	Amethyst
March	Aquamarine	Red Jasper (Bloodstone)	Bloodstone, Jasper
April	Diamond	Rock Crystal (Quartz)	Diamond, Sapphire
May	Emerald	Chrysoprase	Emerald, Agate
June	Pearl (the only non-mineral), Moonstone	Alexandrite	Alexandrite, Emerald
July	Ruby	Jade or Carnelian	Ruby, Onyx
August	Peridot	Aventurine, Sardonyx, or Sapphire	Sardonyx, Carnelian
September	Sapphire	Lapis lazuli	Sapphire, Peridot
October	Opal	Pink Tourmaline	Tourmaline, Aquamarine
November	Yellow Topaz	Citrine or Turquoise	Citrine, Topaz
December	Turquoise, Blue Topaz	Lapis Lazuli or Tanzanite	Zircon, Ruby

An astrological version of the birthstones exists using the twelve zodiac signs instead of the twelve calendar months. Listed below are the dates for the tropical sun signs and their associated birthstone

Sign	Birthstone
Aries (March 21 - April 19)	Diamond
Taurus (April 20 - May 20)	Emerald
Gemini (May 21 - June 20)	Crystal
Cancer (June 21 - July 22)	Pearl
Leo (July 23 - August 22)	Ruby
Virgo (August 23 - September 22)	Sapphire
Libra (September 23 - October 23)	Opal
Scorpio (October 24 - November 21)	Zircon
Sagittarius (November 22 - December 21)	Turquoise
Capricorn (December 22 - January 21)	Garnet
Aquarius (January 22 - February 18)	Amethyst and moonstone
Pisces (February 19 - March 20)	Aquamarine