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Birthstone Finder

Look up the birthstones for any month on both the modern and the traditional lists, with the multi-stone months and the dated official additions shown rather than flattened to one answer.

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How to use

  1. 1.Select a birth month from the list, or use the optional date field and the month will be filled in for you.
  2. 2.Read the modern birthstones first, remembering that six months legitimately carry more than one stone.
  3. 3.Compare against the traditional row, and check the addition note to see which modern stones arrived in 1952, 2002 or 2016.

About Birthstone Finder

Birthstone Finder answers a question that looks simpler than it is. Choose a birth month, or paste an exact birth date and let the page take the month from it, and you get two answers side by side: the stones on the modern list and the stones on the traditional list, along with a note recording when each modern stone was officially added.

Most birthstone pages print a single gem per month. That tidiness is misleading. Six months carry more than one stone on the current list. June has pearl, alexandrite and moonstone. August has peridot, spinel and sardonyx. December has turquoise, tanzanite and zircon. October has opal and tourmaline, November has topaz and citrine, and March keeps bloodstone alongside aquamarine. Anyone born in those months has a genuine choice, and collapsing that choice to one gem is the single most common error in birthstone charts. This page shows the full set every time.

The modern list here follows the current charts published by the Gemological Institute of America and by the American Gem Society. Those two references were compared month by month and agree completely, including on the multi-stone months, which is why the modern column can be stated plainly. The traditional list is a different matter and is handled differently. Traditional charts genuinely disagree with one another from source to source, and some circulating versions are internally inconsistent, listing stones that could not have been traditional at all. Rather than picking one house version and presenting it as settled, this page shows only the stones that two independent gemological references both list, and says so on the page. Where the two lists differ, that difference is the interesting part: bloodstone rather than aquamarine for March, sardonyx rather than peridot for August, turquoise and lapis lazuli rather than tanzanite and zircon for December.

The modern list is not ancient. It descends from a list adopted by the American National Association of Jewelers in 1912, and it has been revised since in documented steps. Alexandrite, tourmaline, citrine and zircon were added in 1952, with zircon displacing lapis lazuli for December. Tanzanite joined December in 2002. Spinel joined peridot for August in 2016. Where a stone has a documented addition year the page shows it; where no addition year could be sourced, no year is shown, because inventing a plausible date would be worse than leaving the field blank.

One deliberate limitation is worth stating. Birthstones are assigned by calendar month, so the exact day never changes the answer. The optional date field exists purely so you can type a birthday you already know rather than working out which month to select, and the page says as much. There is no day-level birthstone standard, and this tool does not pretend otherwise. Zodiac-sign birthstone lists are a separate and much less settled tradition and are not mixed in here.

The lookup runs entirely in your browser. Nothing you enter is uploaded, stored or logged. The tables live in a module covered by its own tests, with seventeen golden cases drawn from the cited references and structural checks that would catch a reordered or truncated table.

Birthstones are a cultural and commercial convention rather than a natural fact, and this page is offered for cultural interest. For a purchase, confirm the stone and its treatment with a qualified jeweller or a gemological laboratory report.

Methodology & sources

Ship two twelve-row lookup tables. The modern table is taken from the current Gemological Institute of America and American Gem Society charts, which were compared month by month and agree completely, including on the six multi-stone months. The traditional table is the intersection of two independent references, the International Gem Society chart and the Brilliant Earth guide, so that only stones both sources list are shown and the known divergence between traditional charts is disclosed rather than hidden. Addition years are attached only where documented, covering the 1952 additions of alexandrite, tourmaline, citrine and zircon, tanzanite in 2002 and spinel in 2016; stones with no sourced year carry none. Month selection is validated to one through twelve, and the optional date entry parses an ISO date, rejects impossible days including February 29 outside a leap year, and then uses only its month, since birthstones carry no day-level precision. Seventeen golden cases across both tables plus length, uniqueness and non-empty invariants guard against a reordered or truncated table.

Frequently asked questions

Why does my month show more than one birthstone?
Because it genuinely has more than one. March, June, August, October, November and December all carry multiple stones on the current list published by the Gemological Institute of America and the American Gem Society. Charts that print a single gem for these months are simplifying.
What is the difference between modern and traditional birthstones?
The modern list descends from one adopted by American jewellers in 1912 and revised in documented steps since, favouring transparent faceted gems. Traditional lists reflect older custom and vary between references, so this page shows only the stones that two independent sources both list.
Does my exact birth date change which stone I get?
No. Birthstones are assigned by calendar month, so the day never affects the result. The date field is only a convenience for filling in the month.

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