January - the traditional birthstone is the Garnet
February - the traditional birthstone is the Amethyst
March - the traditional birthstone is the Bloodstone, however, the modern birthstone for March is Aquamarine.
April - the traditional and modern birthstone is the Diamond.
May - the traditional and modern birthstone is the Emerald.
June - the traditional birthstone is the Pearl, however, the alternate birthstone for June is Moonstone and Alexandrite.
July - both the traditional and modern birthstone for July is the Ruby.
August - the traditional birthstone for August is the Peridot.
September - the traditional birthstone for September is the Sapphire.
October - the modern and traditional birthstones for October are the Opal and the Tourmaline.
November - the modern and traditional birthstones for October are the Topaz and the Citrine.
December - the modern and traditional birthstones for December are the Blue Topaz and the Turquoise.