APRIL
DIAMOND
MAY
EMERALD
JUNE
PEARL, ALEXADRITE, MOONSTONE
JULY
RUBY
AUGUST
PERIDOT, SPINEL
SEPTEMBER
SAPPHIRE
OCTOBER
OPAL, TOURMALINE
NOVEMBER
CITRINE, TOPAZ
DECEMBER
ZIRCON, TURQUOISE, TANZANITE
JANUARY
GARNET
FEBRUARY
AMETHYST
MARCH
AQUAMARINE,BLOODSTONE
SOURCE: GIA.EDU