Each month of the year has a particular gemstone associated to it. They are as follows: January - Garnet February - Amethyst March - Aquamarine April - Diamond May - Emerald June - Pearl, Alexandrite July - Ruby August - Peridot September - Sapphire October - Opal, Rose November - Yellow Topaz, Citrine December - Blue Topaz
The traditional gemstones associated with each birth month are January Garnet February Amethyst March Aquamarine April Diamond May Emerald June Pearl, Alexandrite July Ruby August Peridot September Sapphire October Opal, Pink Tourmaline November Yellow Topaz, Citrine December Blue Topaz, Turquoise, Zircon