In 1912 the American National Association of Jewelers officially adopted a list of birth stone gemstones based on ancient lore.

January-Garnet
February-Amethyst
March-AquaMarine
April- Diamond/Crystal
May Emerald
June- Pearl
July - Ruby
August-Peridot
September-Sapphire
October-Opal
November-Topaz
December Turquoise

In early days, people today wear birth stone jewelry because of the beauty of the birth stones. Discoveries of new gemstones and technological advancements have yielded a wide variety of gemstones in brilliant colors, pastels, neon shades and transparent gemstones.  Which colored gemstones, or birth stones, are popular have more to do with fashion cycles and personal preference than with any desire to improve fortunes or to ward off evil.  However, many still believe that wearing one.s birth stone brings good luck. 

In addition to birth stones for birth months, birth stone gemstones have been given other attributes. Ancient peoples believed that planets could transmit powers to people through birth stones.  Zodiac stones based on astrological signs were thought to transfer magical powers and even supernatural gifts to individuals who wear their birth stone. Colored gemstones were used as amulets and talismans to take advantage of their supposed magical powers.  Birth stone gemstones were also used to predict the future, as aids to healing diseases and as important elements of religious ceremonies.

Zodiac Birth Stones.