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Birthstones
In 1912 a list of stones was adopted by the American National Retail Jewelers' Association as the accepted birthstones, and a few alternates were named where custom in various communities had led to the recognition of a stone differing from the adopted list. Though variations are recognized, the following stones are those selected as birthstones by the Arabian astrologers who brought the idea into Europe in the fifteenth century:  
January - garnet
February - amethyst
March - bloodstone, aquamarine
April - diamond
May - emerald
June - pearl and moonstone		 July - ruby
August - sardonyx, peridot
September - sapphire
October - opal, tourmaline
November - topaz
December - turquoise, lapis lazuli
   
According to astrologers who hold that from the standpoint of the occult powers of gems their true value is to be found only in connection with the sign of the zodiac in which the sun was at the time of one's birth:  
Aquarius - onyx, crystal
Pisces - coral, amber
Aries - amethyst, bloodstone
Taurus - emerald, carnelian
Gemini - aquamarine, hematite
Cancer - pearl, moonstone		 Leo - ruby,jade
Virgo - tourmaline, beryl
Libra - sapphire, opal
Scorpio - agate, malachite
Saggitarius - lapis lazuli, topaz
Capricorn - turquoise, garnet
   

Following Table is for Reference:

Aquarius - January 20 to February 19
Pisces - February 19 to March
Aries - March 20 to April 20
Taurus - April 20 to May 20
Gemini - May 20 to June 21
Cancer - June 21 to July 22
Leo - July 22 to August 22
Virgo - August 22 to September 22
Libra - September 22 to October 23
Scorpio - October 23 to November 23
Saggitarius - November 23 to December 21
Capricorn - December 21 to January 20