June's birthstone is pearl. It is also moonstone. And it is also alexandrite. All three are correct, which is exactly why people keep asking. June is one of only three months on the modern list with more than one stone, and it is the only one where the three could not be less alike: one was made by an animal, one is a trick of light inside feldspar, and one changes colour depending on the lamp you are standing under.
Here is what each one is, and how to work out which is actually yours.
Why June has three
Birthstone lists are not ancient. The modern one is a trade document: a standardised list agreed by American jewellers in 1912, revised since. Pearl is the old entry, carried over from much longer lists that varied by country and century. Moonstone was on the 1912 list alongside it. Alexandrite was added in the 1952 revision — within living memory, and for a practical reason: natural pearl had all but vanished from the trade and the market wanted an alternative with some prestige to it.
So when someone tells you the June birthstone is "really" pearl, they are describing which one is oldest, not which one is right.
Pearl: the only birthstone that was alive
Every other stone on the list is a mineral. Pearl is not. It is made by a mollusc, in layers of aragonite platelets held together with a protein called conchiolin, laid down around something the animal cannot expel. The shimmer is not colour in the pigment sense — it is light interfering across those layers, which is why a pearl looks different as you turn it.
Natural pearls, found by chance in wild oysters, are effectively gone from commerce. Almost every pearl sold today is cultured: the same animal, the same nacre, the same process, started deliberately. That is not a substitute for a pearl. It is a pearl, farmed.
Pearl is also the softest thing anyone wears daily — around 2.5 to 4.5 on the Mohs scale, softer than a copper coin. Perfume, hairspray and vinegar all damage nacre. If you own pearls, they go on last and come off first.
Moonstone: the blue that is not there
Moonstone is orthoclase feldspar that grew in alternating microscopic layers with albite. Light entering the stone scatters off those layers and comes back out as a soft blue glow that seems to float below the surface and move as you tilt it. The effect has its own name — adularescence — and it is scattering, not pigment. There is no blue in the stone to find.
One thing worth knowing before you buy: "rainbow moonstone" is usually not the same mineral. In the trade it almost always means white labradorite, a different feldspar that throws broader flashes of blue, gold and violet. It is a lovely stone and it is honestly named after what it looks like rather than what it is. We sell it, and we say which is which.
We have written about moonstone at length, including where the "moon" folklore actually comes from: Moonstone and the blue that isn't there →
Alexandrite: the one that changes
Miners in the Urals in the 1830s were pulling out green crystals that behaved normally all day and turned red by candlelight. The stone was named for the young Alexander, later Alexander II — and the coincidence was too good to ignore, because green and red were the colours of the Imperial Russian military.
The mechanism is chromium sitting in chrysoberyl in a very narrow window, where the crystal transmits green and red almost equally and lets the light source decide. Daylight is blue-rich, so green wins. Lamplight is red-rich, so red does. The stone is not changing. It is telling you about the room.
The Ural deposit was worked out within decades. Natural alexandrite of any size is one of the rarest gem materials on earth, and if you are looking at an affordable alexandrite, it is laboratory-grown — chemically and structurally the same material, grown rather than found, performing the same colour change for the same reason. Ours is lab-created and the product page says so in the first screen, not in grey type at the bottom.
So which one is yours?
All of them. There is no authority that assigns you one. The lists were written by jewellers' associations, they differ between countries, and they have been revised whenever the trade needed them to be. Pick the one you would actually wear.
If it helps: pearl reads formal and inherited, moonstone reads quiet and personal, alexandrite reads like a party trick you can do with a lamp — and that is not a small thing to own.
What we make for June
The plainest version is Month in Colour — one baguette stone in the month's colour, on a fine chain, in solid gold-plated 925 silver rather than plated brass. The June stone is lavender. It is cubic zirconia cut to the birthstone colour, not a natural gemstone, and we put that on the product page rather than hiding it. A birthstone marks a date; it is not a claim about the stone.
If you want the actual mineral, they live elsewhere on the site and cost what natural stones cost:
- Moonstone — the adularescence, in three settings
- The Threshold Stone — lab-created alexandrite, 6×8 mm oval. Look at it in daylight, then under a lamp.
Made after you order, so allow up to ten days. It arrives in the Asi box, ready to give.
All twelve months, and what each stone actually is →
Where stone meanings actually come from →
A birthstone is a date, not a diagnosis. Nothing here treats, prevents or cures anything.