Birthstones feel ancient, like a tradition passed down unbroken for millennia. Some of that is true. Much of the specific list people use today, though, is younger than most family heirlooms: the United States’ modern, standardized birthstone chart was only adopted in 1912 by the National Association of Jewelers, partly to settle centuries of inconsistent regional lists into one version retailers could actually agree on.
February: Amethyst, By Both Old and New Lists
Amethyst is one of the few birthstones that shows up consistently across both historical and modern lists, and we cover the actual mineralogy behind its purple color, trace iron plus natural background radiation, in our dedicated piece on amethyst. If you’re shopping by birth month, it’s a genuinely easy one to get right: chemically identical to clear quartz, priced accessibly, and widely available in real, untreated specimens.
Not Every Birthstone Is One Mineral
Several months don’t correspond to a single mineral species at all. “Diamond” is straightforward, but “opal” (October) spans a whole range of internal structures and body colors, from the play-of-color material most people picture to fire opal, which gets its name from body color rather than flash, something we get into in our fire opal piece. “Turquoise” (December, on some lists) is frequently confused in the trade with chrysocolla and shattuckite, two visually similar but chemically distinct copper minerals we cover separately.
Modern Lists Still Change
Jewelry trade associations have added alternate stones to several months since 1912, tanzanite was formally added as a December birthstone in 2002, decades after it was first identified in Tanzania in the 1960s, proof that even a “traditional” list keeps evolving as new gem materials become commercially available. It’s worth treating any birthstone chart as a starting point for what to shop for, not a fixed rulebook, especially once you start comparing the version your grandmother knew against the one printed today.
For more on choosing a piece by occasion rather than birth month, see our crystal gift guide.
