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Here is the Traditional birthstone calendar
January
cabochon: Garnet
Faceted: Garnet
February
cabochon: amethyst
faceted: amethyst
March
cabochon: bloodstone
faceted: aquamarine
April
cabochon: pearl and mother of pearl
faceted: diamond
May
cabochon: green onyx
faceted: emerald
June
cabochon: moonstone and pearl
faceted: Alexandrite
July
cabochon: Jasper
faceted: ruby
August
cabochon: carnelian
faceted: peridot
september
cabochon: Lapis Lazuli
faceted: blue sapphire
October
cabochon: Opal
faceted: pink tourmaline
November
cabochon: citrine
faceted: citrine or golden topaz
December
cabochon: turquoise
faceted: zircon and blue tourmaline