Birthstones
There is at least one birthstone for each month, and for some months there are more. For example, December has four and June has three while March, April, August, October, and November have two.
January Garnet
February Amethyst
March Bloodstone or Aquamarine
April Diamond or Black Star Sapphire
May Emerald
June Pearl, Moonstone, or Alexandrite
July Ruby
August Peridot or Sardonyx
September Sapphire
October Opal or Tourmaline
November Topaz or Citrine
December Turquoise, Tanzanite, Zircon, or Lapis