A birthstone is a gift of a precious material that symbolizes the month of birth. There have been many different sets of birthstones used throughout history and in different cultures. In 1912, in an effort to standardize them, the American national association of jewelers, Jewelers of America, officially adopted the following list; it is currently the most widely used list in the United States and many other locations, including Australia and Thailand.
|Birthmonth||Primary Stone||Alternate Stone|
An astrological version of the birthstones exists using the twelve zodiac signs instead of the twelve calendar months. Listed below are the dates for the tropical sun signs and their associated birthstone.
|Aries (March 21 - April 19)||Diamond|
|Taurus (April 20 - May 20)||Emerald|
|Gemini (May 21 - June 20)||Crystal|
|Cancer (June 21 - July 22)||Pearl|
|Leo (July 23 - August 22)||Onyx|
|Virgo (August 23 - September 22)||Sapphire|
|Libra (September 23 - October 23)||Opal|
|Scorpio (October 24 - November 21)||Zircon|
|Sagittarius (November 22 - December 21)||Turquoise|
|Capricorn (December 22 - January 21)||Garnet|
|Aquarius (January 22 - February 18)||Amethyst|
|Pisces (February 19 - March 20)||Aquamarine|