Birthstones are based off of the month of birth, not the date of birth; therefore, the birthstones for the month of Octoberare tourmaline and opal.
The Two Octobers was created in 1927.
The two birthstones of April is Diamond. Sorry, I do not think there is another stone for April.
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Opal
diamond and aquamarine
Not all birthstones.
i think it is earth
Birthstones represent the month on which you were born.
It depends on what context if it is October's which is possessive as if October is owning something. if it is like "Many Octobers" then you would not need an apostrophe.
Tuesday
The two August birthstones are peridot and sardonyx.
The birth stone of the month of October is opal. So if your birthday is on October 9th, then yes, your birthstone would be opal. The birthstones by month are: January - Garnet February - Amethyst March - Aquamarine April - Diamond May - Emerald June - Pearl July - Ruby August - Peridot September - Sapphire October - Opal November - Topaz December - Zircon