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What Are the Capricorn Stones and Birthstones?

By Digital Towns Crystals ยท Last reviewed October 7, 2026

Short answer: the traditional zodiac stone for Capricorn is ruby, according to the list published by the gem expert George F. Kunz in 1913. Modern crystal traditions often add dark, earthy stones for this earth sign, especially smoky quartz, black obsidian and black tourmaline. Because Capricorn runs from about December 22 to January 19, people born under the sign can also use the December birthstones, turquoise, tanzanite and zircon, or the January birthstone, garnet. Zodiac stones are a tradition rooted in astrology, not a property of the stones.

When is Capricorn?

Capricorn, Latin for "horned goat", is the tenth sign of the zodiac, named for the constellation Capricornus. Under the tropical zodiac used in Western astrology, the sun passes through Capricorn from about December 22 to January 19 or 20; the exact dates shift slightly from year to year. It is an earth sign, along with Taurus and Virgo, and a cardinal sign, its ruling planet in astrology is Saturn, and its opposite sign is Cancer. In India, the sun's entry into Capricorn is celebrated in mid-January as the festival of Makara Sankranti.

What is the Capricorn zodiac stone?

Zodiac stones and birthstones are different lists. Birthstones follow the calendar month; zodiac stones follow the astrological sign. In his 1913 book The Curious Lore of Precious Stones, George Frederick Kunz gave a stone for each sign, and for Capricorn that stone is ruby.

Ruby is red corundum, colored by chromium. At 9 on the Mohs scale it is one of the hardest gems, and Myanmar's Mogok area has produced some of the most sought-after rubies for more than five centuries. It is the July birthstone, covered in the July guide. For a more affordable red, many Capricorns choose ruby-bearing rocks such as ruby in zoisite, or January's garnet.

Which stones are linked with Capricorn today?

Modern crystal shops and guides often name dark, grounding stones for Capricorn:

  • Smoky quartz: brown to black quartz colored by natural radiation. In crystal traditions it is a grounding stone, and it is often named as a stone for Capricorn.
  • Black obsidian: natural volcanic glass, associated in crystal traditions with protection, grounding and self-reflection.
  • Black tourmaline: striated, three-sided crystals, one of the best-known grounding and protection stones.
  • Ruby: the traditional stone.

These modern pairings vary from source to source. They are traditions and personal choices rather than a fixed rule.

What are the Capricorn birthstones?

Because Capricorn spans two months, people often use the birthstone of their birth month as well:

  • Born December 22 to December 31: the December birthstones are turquoise, tanzanite and zircon; see the December guide.
  • Born January 1 to January 19: the January birthstone is garnet, best known in deep red.

Garnet's deep red makes a natural partner for ruby, Capricorn's traditional stone.

What do Capricorn stones mean in tradition?

Capricorn is an earth sign pictured as a horned goat, and its modern crystal picks lean toward dark, earthy grounding stones. Smoky quartz, obsidian and black tourmaline are all linked with grounding and protection in crystal traditions, and ruby has long been a symbol of power in Indian jewelry.

These are traditions and beliefs. Astrology has been recognized as pseudoscientific since the 18th century, and there is no scientific evidence that zodiac signs or the stones linked with them affect personality or events. People enjoy zodiac stones as personal symbols and gifts.

How do people use Capricorn stones?

  • As jewelry: a ruby or garnet ring, or a turquoise pendant, makes a popular birthday gift.
  • As a desk or pocket stone: a smoky quartz point or an obsidian tumble kept nearby as a personal reminder.
  • In meditation: as a focus object, as described in the meditation guide.
  • For grounding: the dark stones on this list double as grounding stones, covered in the grounding guide.

How do you choose a Capricorn stone?

  • For a traditional choice, pick ruby, or ruby in zoisite for a lower price.
  • For grounding, pick smoky quartz, obsidian or black tourmaline.
  • For a birthstone, pick garnet for January, or turquoise, tanzanite or zircon for December.
  • For jewelry worn daily, ruby, at 9 on the Mohs scale, is the most durable. Garnet is 6.5 to 7.5, smoky quartz and tourmaline about 7, and turquoise and obsidian softer, about 5 to 6.

How do you care for Capricorn stones?

  • Ruby: warm, soapy water is safe in most cases; glass-filled or dyed rubies need only a damp cloth.
  • Garnet: warm, soapy water and a soft brush; steam cleaning is not recommended.
  • Smoky quartz and tourmaline: warm water and mild soap; keep smoky quartz out of strong sunlight.
  • Turquoise: keep it away from heat, acids, cosmetics and perfume.

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Frequently asked questions

What is the Capricorn birthstone?

The traditional zodiac stone for Capricorn is ruby. By birth month, December Capricorns have turquoise, tanzanite and zircon, and January Capricorns have garnet.

What crystals are good for Capricorn?

In crystal traditions, the most common choices are ruby, smoky quartz, black obsidian and black tourmaline. These are traditional pairings rather than proven effects.

What are the dates for Capricorn?

About December 22 to January 19 under the tropical zodiac. The exact dates shift slightly each year.

Is smoky quartz a Capricorn stone?

Smoky quartz is often named for Capricorn in modern crystal traditions, as a grounding stone for an earth sign.

Do zodiac stones have real effects?

There is no scientific evidence that they do. Astrology is considered pseudoscience; zodiac stones are enjoyed as traditions, symbols and gifts.

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