January garnet

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February         amethyst

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March aquamarine          -  bloodstone

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April         diamond -        crystal

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May emerald        - agate

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June        pearl -         moonstone -          alexandrite

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July ruby        - carnelian        - onyx

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August         peridot

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September sapphire         - lapis lazuli

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October         opal -         pink tourmaline

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November citrine          - yellow topaz

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December        topaz -        turquoise -      tanzanite

                                   blue zircon