Birthstones:
Traditionally, a birthstone is associated with each month of the year. For example, the month stone for January is garnet, while lucky children born in April get a diamond as their month stone.
The origin of the month stone is believed to go back to Aaron's breastplate which contained twelve precious stones representing the twelve tribes of Israel. The modern list dates back to 1912 with only one addition since then, tanzanite as December's month stone.
There are many legends and myths about the healing powers of moonstones and their therapeutic influence. Carrying your birthstone close to your heart is widely believed to bring good luck.

January -
Garnet
February -
Amethyst
March -
Aquamarine
April -
Diamond
May -
Emerald
June -
Alexandrite
July -
Ruby
August -
Peridot
September -
Sapphire

October -
Opal and
Tourmaline

November -
Topaz and
Citrine

December -
Tanzanite and
Zircon