The list of birthstones can vary, depending on where you look, but here is a fairly standard list of traditional and modern birthstones.

Month	Traditional	Modern
January	Garnet	Garnet
February	Amethyst	Amethyst
March	Bloodstone	Aquamarine
April	Diamond	Diamond
May	Emerald	Emerald
June	Alexandrite	Pearl
July	Ruby	Ruby
August	Aventurine	Peridot
September	Sapphire	Sapphire
October	Tourmaline	Opal
November	Citrine	Topaz
December	Zircon	Turquoise