Why do some months have several birthstones?
Most months have one stone. A few have three or four, and June and December have the most of all. The reason is availability and commerce as much as symbolism.
By Jamey Weber, editor and developer at FusionStudios. Last reviewed .
The months with the most stones
December: 4 stones
| Stone | Color | Role |
|---|---|---|
| Turquoise | Sky blue to teal | modern |
| Tanzanite | Violet blue | alternative |
| Zircon | Blue to colorless | alternative |
| Blue Topaz | Pale to sky blue | alternative |
April: 3 stones
| Stone | Color | Role |
|---|---|---|
| Diamond | Colorless | modern |
| White Sapphire | Colorless to pale grey | alternative |
| Rock Crystal | Clear | alternative |
May: 3 stones
| Stone | Color | Role |
|---|---|---|
| Emerald | Rich green | modern |
| Chrysoprase | Apple green | alternative |
| Agate | Banded, many colors | alternative |
June: 3 stones
| Stone | Color | Role |
|---|---|---|
| Pearl | Creamy white | modern |
| Alexandrite | Color-change, green to red | alternative |
| Moonstone | Milky white with blue sheen | alternative |
August: 3 stones
| Stone | Color | Role |
|---|---|---|
| Peridot | Olive green | modern |
| Spinel | Red to pink | alternative |
| Sardonyx | Banded red-brown and white | traditional |
Why extra stones get added
Two ordinary forces, neither of them mystical. The first is availability: when a month's classic stone is rare or expensive, the trade needs something it can actually sell, and a more obtainable stone in a similar color drifts onto the list. The second is discovery: a gem that did not exist commercially a century ago can be added later, which is how a modern stone ends up sitting beside one that has been on the list for generations.
June shows both effects at once. Pearl is the old classic and comes from a living animal rather than the ground. Alexandrite is spectacular, changing color between daylight and lamplight, and correspondingly scarce. Moonstone is the affordable, widely available option. Three stones, three different reasons to be on the list.
Watch out for blended descriptions
When a month has several stones, careless writing merges their properties into one sentence, and you end up reading that a pearl changes color. It does not; alexandrite does. Every stone on this site now carries its own color field for exactly that reason, and the month pages never describe one stone using another's properties.
How to choose one
Choose on color first, then on budget. If you are buying for someone else, the modern stone is the safe answer because it is the one a shop will have. If you are choosing for yourself, read the meanings on the month pages and pick the one you like. The difference between the modern and traditional lists is covered in the comparison guide.
Frequently asked questions
Which months have more than one birthstone?
On the list used here, June and December carry the most, with three and four recognized stones. Several other months carry two: a primary stone plus one widely accepted alternative.
Is a pearl a real birthstone if it is not a mineral?
Yes, within the tradition. Pearl is organic, formed inside a living mollusc rather than in rock, which makes it unusual among birthstones but does not disqualify it. It is the classic June stone and has been for a long time.
Are cultured pearls acceptable as a June birthstone?
In practice, yes, and almost every pearl sold today is cultured. The distinction is about how the pearl was started, not about what it is. Nothing in the birthstone tradition requires a wild pearl.
Which of a month's stones is the real one?
All of them. A month with several stones simply has several traditions attached to it. If you want the one a shop will have in stock, that is the modern stone listed first on each month page.
Sources and limits
The color and role of each stone below come from this site's own reference data, which reflects current common usage. The historical account of why extra stones were added is a general summary and is not sourced to a single document; treat it as context, not as a citation. Where you need a firm date or a formal attribution, ask a gemmological body directly.
Keep reading
Every guide is listed on the guides hub. How the reference data on this site is put together, and where it comes from, is on the methodology page.