Here's a comprehensive guide to birthstones. Birthstones are traditionally associated with each month of the year, and some modern systems include stones for every day of the week.
Birthstones by Month
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January: Garnet
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February: Amethyst
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March: Aquamarine, Bloodstone
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April: Diamond
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May: Emerald
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June: Pearl, Alexandrite, Moonstone
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July: Ruby
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August: Peridot, Spinel, Sardonyx
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September: Sapphire
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October: Opal, Tourmaline
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November: Topaz, Citrine
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December: Turquoise, Tanzanite, Zircon
Birthstones by Zodiac Sign
An alternate tradition links stones to astrological signs:
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Aries (Mar 21–Apr 19): Diamond, Bloodstone
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Taurus (Apr 20–May 20): Emerald, Sapphire
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Gemini (May 21–Jun 20): Pearl, Agate
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Cancer (Jun 21–Jul 22): Ruby, Moonstone
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Leo (Jul 23–Aug 22): Peridot, Onyx
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Virgo (Aug 23–Sep 22): Sapphire, Carnelian
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Libra (Sep 23–Oct 22): Opal, Lapis Lazuli
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Scorpio (Oct 23–Nov 21): Topaz, Beryl
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Sagittarius (Nov 22–Dec 21): Turquoise, Zircon
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Capricorn (Dec 22–Jan 19): Garnet, Ruby
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Aquarius (Jan 20–Feb 18): Amethyst, Garnet
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Pisces (Feb 19–Mar 20): Aquamarine, Amethyst
Birthstones by Day of the Week
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Sunday: Topaz, Diamond
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Monday: Pearl, Moonstone
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Tuesday: Ruby, Garnet
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Wednesday: Amethyst, Citrine
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Thursday: Sapphire, Turquoise
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Friday: Emerald, Carnelian
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Saturday: Onyx, Lapis Lazuli