Birthstone Calculator - Find Your Gemstone

What Is a Birthstone Calculator?

A birthstone calculator is a free tool that tells you which gemstone is traditionally associated with your birth month or zodiac sign. Enter your date of birth, and this calculator instantly shows three results: your modern birthstone, your traditional birthstone, and your zodiac birthstone based on your exact birth date.

Birthstones are gemstones linked to each month of the year, a tradition believed to date back to the breastplate of the biblical high priest Aaron, described as set with twelve gemstones representing the twelve tribes of Israel. The modern list used by most Western jewelers today was standardized in 1912 by the National Association of Jewelers.

How to Find Your Birthstone

1. Enter your date of birth - Type or select your full birth date in the calculator above.

2. Click Find My Birthstone - Results appear instantly with no page reload.

3. View your three results - See your modern birthstone, traditional birthstone, and zodiac birthstone all at once.

4. Check the full chart - Scroll down to see every month's birthstones if you want to look up a friend or family member's stone too.

Complete Birthstone Chart by Month

Here is the full list of modern and traditional birthstones for every month, based on the standard list used by Jewelers of America:

Zodiac Birthstones vs. Birth Month Stones

Your zodiac birthstone is different from your birth month stone. While a birth month stone is fixed to the calendar month, a zodiac birthstone follows Western astrology's twelve sun signs, each spanning a specific date range that usually starts partway through one month and ends partway through the next. For example, someone born on March 25 is a Taurus-adjacent Aries, not tied strictly to "March," which is why this calculator checks your exact date rather than just the month for the zodiac result.

Looking for a Vedic or Hindu Birthstone (Ratna)?

This calculator shows Western birthstones (modern and traditional) and Western zodiac birthstones, based only on your date of birth. It is important to know that this is different from a Vedic or Hindu birthstone (Ratna), which is not determined by your birth date alone.

In Vedic astrology, your recommended gemstone is based on your Moon sign (Rashi) and planetary positions at your exact time and place of birth, calculated from a full birth chart (Kundli). Because this requires precise birth time and location rather than just a calendar date, we cannot accurately calculate it with a simple date-of-birth tool - and we would rather tell you that honestly than show you an inaccurate result. For a genuine Vedic birthstone recommendation, please consult a qualified Vedic astrologer or a dedicated birth-chart calculator that accounts for birth time and place.

A Short History of Birthstones

The idea of associating gemstones with each month has roots that trace back thousands of years, though the exact list has shifted many times across cultures. One commonly cited origin is the biblical breastplate of Aaron, described in the Book of Exodus as set with twelve different gemstones, each representing one of the twelve tribes of Israel. Some historians connect these twelve stones to the twelve months of the year and the twelve signs of the zodiac, though the exact stone-to-month pairings used in ancient times differ from the modern list.

The birthstone tradition as most people know it today - one specific stone assigned to each calendar month - became popular in 18th century Poland and Germany, then spread through Europe and the United States. In 1912, the National Association of Jewelers (now known as Jewelers of America) held a meeting to officially standardize the list used across the American jewelry trade, resolving inconsistencies between regional traditions. That list has been revised several times since, most recently in 2002 when tanzanite was added as an alternate for December, and in 2016 when spinel was added alongside peridot for August.

Today, birthstones remain popular not because of any scientific backing, but as a meaningful, personal way to choose jewelry - whether for a birthday gift, a piece that represents a child's birth month, or simply a stone someone feels connected to.

Frequently Asked Questions

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