Jewellery / Traditional reference
Birthstone by Month: Find Your Birthstone
Find your birthstone by month, compare modern and traditional lists, explore colours and Mohs hardness, and download a birthday gem card.
Birthstone by Month: Find Your Birthstone: Shows the modern US birthstone list alongside one common English-language traditional list. All twelve months include typical colours, mineral family or material, established Mohs hardness values and a short traditional symbolic association. Months with several accepted modern stones show each alternative, including pearl, moonstone and alexandrite for June. Original gem drawings and a downloadable card make the month easy to share. Runs 100% locally in your browser with zero server file uploads.
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All twelve months
Swatches show typical colours, not every natural or treated variety. Pearl is organic and opal is a mineraloid; neither is a mineral species. Symbolic meanings are traditions, not scientific properties.
Modern and traditional month lists
Jewelers of America's birthstone guide (https://www.jewelers.org/education/gemstone-guide/birthstones) is the source for the modern US list and its later additions. The 1912 standardisation was followed by revisions including tanzanite in 2002 and spinel in 2016.
The traditional column uses a conservative common English-language selection: garnet, amethyst, bloodstone, diamond, emerald, pearl, ruby, sardonyx, sapphire, opal, topaz and turquoise, in calendar order. GIA's birthstone overview (https://www.gia.edu/birthstones) describes month associations and historical alternatives. Historical and national lists differ.
Gem materials, colours and hardness
GIA's gem encyclopaedia (https://www.gia.edu/gem-encyclopedia) documents gemstone materials and established hardness ranges. Ruby and sapphire are corundum; emerald and aquamarine are beryl. Pearl is biogenic calcium carbonate, while opal is hydrated silica without a crystalline mineral structure.
Colour swatches are illustrative choices made for this page. Natural and treated colours vary. Mohs values describe scratch resistance; the short symbolism lines describe traditions and are not physical properties.
How to use it
- Choose a month or enter a birth date.
- Compare modern and traditional stones, colours and hardness.
- Choose a stone for your card and download the image.
Privacy & limitations
Your number and birth date stay in your browser. Share cards do not include your birth date.
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Frequently asked questions
How do modern and traditional lists differ?
The modern US list follows the trade association's standardised month assignments and later additions. Traditional lists preserve older associations and vary by country and publication. This page shows one common traditional selection rather than a universal historical list.
Why do some months have several birthstones?
Later additions and regional traditions provide alternatives. June commonly includes pearl, moonstone and alexandrite; October has opal and tourmaline; December has turquoise, zircon and tanzanite. Each modern alternative is shown together.
Who decided the modern list?
The American National Association of Jewelers adopted a standardised US list in 1912. Jewelers of America maintains the modern list today. Tanzanite joined December in 2002, and spinel joined August in 2016; other revisions also occurred after 1912.
Are zodiac birthstones different?
Yes. Zodiac birthstone systems assign stones to astrological signs rather than calendar months, and those lists also vary. This tool uses birth months only.
What does Mohs hardness say about everyday wear?
Mohs hardness ranks scratch resistance from 1 to 10 and is not a linear scale. Diamond is 10, corundum is 9 and quartz is 7. Hardness alone does not describe toughness, cleavage or resistance to chemicals and temperature changes.
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