The Capricorn birthstone is garnet — and because Capricorn spans 22 December to 19 January, December-born Capricorns can also claim blue topaz, tanzanite, turquoise and zircon. This guide explains which stones belong to Capricorn, what they traditionally mean, and how to choose between them.
Capricorn is the tenth sign of the zodiac, running from 22 December to 19 January. That places it across two birthstone months: the December stones (blue topaz, tanzanite, turquoise and zircon) for Capricorns born before New Year, and garnet — the January birthstone — for those born from 1 January. Garnet is the stone most strongly tied to the sign as a whole by tradition.
Garnet's deep red colour and traditional associations — loyalty, endurance, devotion and protection on journeys — have long been matched with Capricorn's steadfast reputation. These pairings are folklore rather than fact, but they've persisted for centuries and give garnet jewellery genuine personal meaning for Capricorns. Garnet is durable too, at 6.5–7.5 on the Mohs scale, and is typically sold untreated. Learn more on our garnet stone guide.
Capricorns born 22–31 December share the December birthstones. Blue topaz brings a cool sky-to-London-blue palette, while tanzanite offers a rare violet-blue. Both make striking alternatives to garnet's warmth — explore December birthstone jewellery and tanzanite jewellery.
For a birthday in January, garnet is the classic pick — browse Capricorn zodiac jewellery or the full garnet jewellery collection. For late-December birthdays, let the recipient's favourite colour decide: warm red garnet, cool blue topaz or violet tanzanite. Every Irosk piece is crafted in 925 sterling silver. You can also explore the wider January birthstone collection or read what is the January birthstone.
