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I think it has to do with the hardness of the stone. Only 3 Months have secondary stones. I know that the 3 main birthmonths that have secondary stones are very fragile. Another Fragile is Emerald so never get it wet! Hope this helps.

June - Pearl Hardness 3-4

June Secondary is Alexandrite Hardness 8.5

October - Opal Hardness 5.5-6.5

October Secondary Stone Pink Tourmaline Hardness 7-7.5

December - Turquoise Hardness 5-6

December - Secondary Stone Blue Zircon Hardness 6.5-7

MOHS Scale for Harness 1-10, 10 being Diamond the hardest stone

by Micah5five

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12y ago

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