LunaThe main stone: Aquamarine
Aquamarine is beryl, the same mineral species as emerald; only the trace element differs, and here it is iron rather than chromium. That is the whole reason one is sea-blue and the other deep green. It also grows in unusually clean crystals, occasionally enormous ones, which makes it the rare gem that can be bought large and eye-clean without a serious budget - where an emerald is expected to carry a garden of inclusions, an aquamarine is expected to carry almost none. Buy it big if you want to: the tradition has no opinion about size and never did.
Nearly all of it is heated, at fairly low temperatures, to drive off a green or yellow cast and leave pure blue. That is permanent, undetectable and universal enough that untreated stones with a natural green tint have become a small collector’s corner of the market. The trade’s names for the deepest colours - Santa Maria, Santa Maria Africana - describe a shade rather than certify anything, which is worth remembering when a price leans on one.
As for the correspondence: Neptune rules Pisces in the modern scheme, the sign is mutable water, and the tradition reached for the transparent blue stone with the sea in its name. What it is for is smaller than shops imply, since a stone changes nothing on its own - but a cool, hard object on the hand is a way of finding your own outline again in a room full of other people’s moods, and that is a real job for an object to have.
Other Pisces stones
Pearl and moonstone are the soft, low-light half of the list, and they are here for the same reason: neither has a colour so much as a behaviour. A pearl’s glow is light bouncing between microscopic layers of nacre laid down by a living animal; a moonstone’s is light scattering off internal layers in feldspar. Both look wrong under a shop’s spotlights and right in the sort of light people actually live in.
They are also the two most demanding objects on this page, which is fair to say before anyone buys one. Pearl sits around Mohs 3 and dissolves in acids, including the ones in perfume and hairspray; moonstone parts along an internal plane if it is struck. Neither belongs on a hand that gardens. Aquamarine is the one that can take a life.
How to choose and wear it
Three stones, three entirely different maintenance regimes, so treat them as three objects rather than one list. Aquamarine first, because it is the forgiving one: warm water, soap, a soft brush, an ultrasonic cleaner if the stone is clean, and no particular anxiety - Mohs 7.5 to 8, and it does not fade.
Pearl next, and it is the opposite: on last after perfume and hairspray, off first, wiped with a soft damp cloth after wearing, never in an ultrasonic bath, never near vinegar or lemon, restrung every year or two if it goes out often. Moonstone sits between them - no knocks, no ultrasonic, and a pendant will always outlive a ring.
Choosing is simpler than the upkeep. Hold an aquamarine against white paper in daylight and decide whether the colour survives away from a spotlit case. Look into a pearl for a glow that seems to come from underneath rather than a shine sitting on the surface. Tilt a moonstone and take the one whose light moves as a sheet rather than a patch.
Why sources disagree on the stones
Lists of stones for Pisces differ from book to book and shop to shop - and that is normal: there is no single canon. The astrological tradition derived stones from ruling planets and elements, the jewellery tradition from the month of birth (the American birthstone table of 1912), and shops happily add to the lists whatever sits in the display case.
We fixed the overlap of the most common lists - the core that repeats most often. If another source names a different stone for you, neither list is wrong: pick the stone from the tradition that you actually like.
The sign and its stones at a glance
| Attribute | Value |
|---|---|
| Sign | ♓︎ Pisces |
| Dates | Feb 19 – Mar 20 |
| Element | water |
| Main stone | Aquamarine |
| Other stones | Pearl, Moonstone |
Frequently asked questions
What is the Pisces birthstone?
The traditional main stone for Pisces is the aquamarine, and the sign is also linked with pearl and moonstone. There is no single canon: lists vary between schools, so no pick from this set is “wrong”.
Pisces starts in February - is my stone amethyst or aquamarine?
Aquamarine by the zodiac, the whole way from 19 February to 20 March. The month chart gives amethyst to anyone born in February and aquamarine to March, so Pisces born in the first ten days collect two different answers from two different systems while later ones get the same answer twice. Neither chart outranks the other; the February and March pages set out the calendar side.
Aquamarine and blue topaz look identical - how do I tell them apart?
By price and by trust, mostly: sky-blue topaz is irradiated colourless topaz and costs a fraction of aquamarine, which is why so much of it turns up in aquamarine-shaped settings. To the eye, topaz tends towards a purer, more electric blue and aquamarine towards a softer, slightly greenish one - but the honest answer is that a gemmologist with a refractometer settles it in seconds, and nobody paying a real price should be guessing.
Matching stones to zodiac signs is a tradition, not science: there is no single canonical list, and schools disagree. Stones do not heal and do not guarantee events - for health questions, see a doctor. A stone here is a symbol and a reminder, nothing more and nothing less.
A reading from your date, not your sign
A stone by sign is shared by millions of people. In the app, Luna builds a reading from your full birth date: strengths, talents, a daily forecast - and tells it by voice.
Open Luna