Reference
Birthstones by Month
Modern and traditional birthstone designations, the history behind each assignment, and links to the full geological profile for every stone.
Modern designations follow the American Gem Trade Association and Jewelers of America standards. Traditional designations predate the 1912 standardization.
Month 1
January
Alternative
Garnet has represented January since the ancient world. The name comes from the Latin 'granatum' (pomegranate) for the stone's resemblance to the fruit's seeds. The National Association of Jewelers formalized it in 1912.
Month 2
February
Alternative
Amethyst was considered as valuable as diamond until massive Brazilian deposits were found in the 18th century. The ancient Greeks believed it prevented intoxication - the name literally means 'not drunk.'
Month 3
March
Traditional
Bloodstone →Bloodstone was March's original birthstone for centuries before the jewelry industry replaced it with the more commercially appealing aquamarine in 1912. Bloodstone remains the traditional alternative.
Month 4
April
Alternatives
Diamond's association with April dates to the 15th century. Its status as the engagement stone is largely a 20th century invention by De Beers. Before industrial mining, diamonds were genuinely rare and restricted to royalty.
Month 5
May
Alternative
Emerald has been May's birthstone since antiquity. Cleopatra claimed ownership of all Egyptian emerald mines. The Incas and Aztecs revered emeralds as sacred. Colombian mines remain the world's finest source.
Month 6
June
Traditional
Alexandrite →Alternative
June is unusual in having three recognized birthstones. Pearl is the traditional choice, alexandrite was added in 1952 for its rarity, and moonstone offers an affordable alternative. All three share an ethereal, light-playing quality.
Month 7
July
Alternative
Ruby has been the king of July since ancient Hindu tradition assigned gemstones to celestial bodies. Sanskrit texts call ruby 'ratnaraj' - king of precious stones. Fine rubies have sold for more per carat than diamonds.
Month 9
September
Alternative
Sapphire has represented September since the Middle Ages, when clergy wore blue sapphires to symbolize heaven. The most famous sapphire in modern history is Princess Diana's engagement ring, now worn by Catherine, Princess of Wales.
Month 10
October
Traditional
Tourmaline →Opal suffered a reputation crisis in the 19th century after Walter Scott's novel 'Anne of Geierstein' associated it with bad luck. The Australian opal industry spent decades rehabilitating the stone's image. Tourmaline was added as an alternative in 1912.
Month 12
December
Traditional
Turquoise →Alternatives
December has the most birthstones of any month. Turquoise is ancient, zircon is historic, and tanzanite was added in 2002 after heavy lobbying by Tiffany & Co. All share a blue palette but are vastly different minerals.
A Brief History of Birthstones
The concept of birthstones traces to the biblical Breastplate of Aaron, which contained twelve stones representing the twelve tribes of Israel. By the 18th century, the practice of wearing a stone corresponding to one's birth month had become popular in Europe.
In 1912, the National Association of Jewelers (now Jewelers of America) standardized the modern birthstone list in the United States. This list has been updated several times since: alexandrite was added for June in 1952, tanzanite for December in 2002, and spinel for August in 2016.
The selections reflect both historical tradition and commercial interests. Some changes were driven by availability (bloodstone replaced by aquamarine for March) while others were driven by industry lobbying (tanzanite's addition by Tiffany & Co.).