Birthstones are precious or semiprecious stones associated to months (or zodiacal signs). There is no particular meaning to them - unless you happen to be superstitious.
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Tibet may have started birthstones over a thousand years ago. Traditional birthstones began in the 15th century; Today's birthstones were created in 1912 by the American Jewelers Association.
The mean of a collection of identical numbers is always the identical number itself; in this instance, 12.
mean in math mean the average Ex. 12 + 12 =24 now divide that by 2 the answer is 12
Mean = 14 Median = 12 Mode = 12
The mean is 12.4