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

Modern Birthstone

Garnet

The Warrior's Stone

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

Modern Birthstone

Amethyst

The Stone of Spiritual Wisdom

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

Modern Birthstone

Aquamarine

The Sailor's Gem

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

Modern Birthstone

Diamond

The Invincible

Alternatives

Clear QuartzHerkimer Diamond

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

Modern Birthstone

Emerald

The Stone of Successful Love

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

Modern Birthstone

Pearl

The Gem of the Sea

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

Modern Birthstone

Ruby

The King of Gems

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 8

August

Modern Birthstone

Peridot

The Evening Emerald

Traditional

Spinel

Alternative

Sardonyx

Peridot was mined on the Egyptian island of Zabargad for over 3,500 years. Spinel was added as an August birthstone in 2016 - a long overdue recognition after centuries of being confused with ruby.

Month 9

September

Modern Birthstone

Sapphire

The Gem of the Heavens

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

Modern Birthstone

Opal

The Eye Stone

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 11

November

Modern Birthstone

Topaz

The Stone of Clarity

Traditional

Citrine

Topaz and citrine share November. Most 'citrine' in jewelry stores is actually heat-treated amethyst. Imperial topaz from Brazil (natural orange) is vastly more valuable than the ubiquitous treated blue topaz.

Month 12

December

Modern Birthstone

Tanzanite

The Generation Stone

Traditional

Turquoise

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.).