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October Birthstone Guide - Opal and Tourmaline | Joseph's Jewelry
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Wash blog: birthstone color chart
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What is my Birthstone? - International Gem Society
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October Birthstones: Pink Tourmaline and Opal - International Gem Society
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Birthstone - Wikipedia
Zodiac stones - nice alternative to birthstones. If ever I get a family stones ring, I might consider these instead… | Zodiac stones, Astrology zodiac, Zodiac signs
OCTOBER BIRTHSTONE | GeorGems has your bright Tourmaline & Opal!
Tourmaline - The October Birthstone
What is the gemstone for October 20th? Find out here