January is the simplest month on both lists: there is one stone, garnet, and the modern American list and the traditional United Kingdom list agree.
The two lists for January
Modern list (American Gem Society): Garnet
Traditional list (United Kingdom, National Association of Goldsmiths, 1937): Garnet
There is no single official birthstone list, so you are free to choose whichever you prefer. You can check any month with our birthstone finder.
About the stones
Garnet
Garnet is a family of silicate minerals rather than one stone, best known in deep red. The name comes from the Latin granatum, pomegranate, for the seed-like crystals. With a hardness of roughly 6.5 to 7.5 it suits everyday jewellery, and it has been set in rings and brooches since ancient times. For the full picture, read our garnet guide.
How the idea developed
Because there is no difference between the two lists in January, it is a good month to see how the tradition works. The idea is often traced to Josephus, the first-century writer who linked the twelve stones of the High Priest’s breastplate, described in the Book of Exodus, to the twelve months and to the signs of the zodiac. Whether a particular Hebrew name in that passage means a modern garnet is debated by scholars, so the link is better described as a tradition than as a proven identification.
For the wider history of the idea, see our birthstones overview. The modern list follows the American Gem Society, and the traditional list follows the 1937 United Kingdom list, both summarised in Wikipedia, Birthstone.
A different system
Vedic gemstone (ratna) guidance is a different system from birthstones. It is tied to the nine planets and to a birth chart, not to the calendar month, and it belongs to the Vedic tradition, which is covered on our sister site, Nidarshana Vedh. Nothing on this page is Vedic advice.
A note on health. Crystals are valued for beauty, meaning and ritual. There is no scientific evidence that they treat health conditions. If you are struggling with your health or mood, please speak to a doctor.
Frequently asked questions
↳ Is garnet always red?
No. The garnet family includes orange, green, yellow and pink stones, although deep red is the classic January colour.
↳ Why do both lists give garnet for January?
The 1912 American list and the 1937 United Kingdom list both kept garnet, which is one of the oldest and most stable choices in the tradition.