Black onyx has collected more meanings than most stones. Its name is Greek for “fingernail.” Romans cut seals and cameos from banded onyx, Victorians wore it in mourning, and Art Deco jewelers set it beside diamonds. The old birthstone and zodiac lists give onyx to July and to Leo. Medieval writers blamed it for bad dreams and quarrels; crystal sellers today call it a stone of protection and strength. This guide separates what is documented from what is believed, and ends with what a black onyx ring says on a man’s hand now.
Key takeaways
- The name means “fingernail.” Onyx is the ancient Greek word for a nail or claw, and Pliny describes a white band in the stone that looks like one.
- The history is real. Roman seals and cameos, Victorian mourning jewelry, and Art Deco black and white are all well documented.
- A traditional July stone. Old birthstone and zodiac lists give onyx to July and to Leo. Today’s US list gives July to ruby and keeps sardonyx, onyx banded with red-brown sard, for August.
- The powers are beliefs. Protection, strength, and grounding come from crystal sellers; medieval writers believed the opposite. Neither is a property of the stone.
- Which finger is your call. Astrology sites disagree. For style, a statement onyx ring sits best on the right ring or middle finger.
In this guide The name History The Bible Birthstone Beliefs Which finger Bad luck? Today FAQ
What the name means
Onyx comes from the ancient Greek onyx, meaning “claw” or “fingernail,” and reached English in the 13th century through Latin and Old French, according to the Online Etymology Dictionary. The reason is in the stone. Pliny the Elder, quoting an earlier writer named Sudines, describes onyx with “a white band resembling a human fingernail,” and the dictionary adds that some onyx has the color of a fingernail too.
Many jewelry sites tell a myth to go with it: Cupid, or Eros, trims Venus’s fingernails while she sleeps, and the gods turn the clippings to stone so that no part of a goddess can perish. It is a charming story, but we could not trace it to any ancient text, so treat it as modern lore rather than Greek myth.
Strictly, onyx means a banded stone, with straight layers of two or more colors. The black onyx in men’s rings is an even black chalcedony, almost always colored by a permanent treatment the Romans already knew; our guide to black onyx rings explains why that doesn’t make it fake.
Black onyx through history
Rome. Banded onyx and its red-layered cousin, sardonyx, were favorite seal stones of the Roman world. Pliny reports, citing earlier writers, that sardonyx was almost the only gem that, engraved as a signet, didn’t carry the sealing wax away with it, and that the first Roman to adopt one was the elder Scipio Africanus. The great Roman cameos were cut from layered stone: the Gemma Augustea, carved around AD 9 to 12 and now in Vienna’s Kunsthistorisches Museum, is cut from a single stone with two layers, which the museum calls sardonyx.
Victorian mourning. When Prince Albert died in 1861, Queen Victoria stayed in mourning for the rest of her life, and black jewelry became the fashion of grief. Whitby jet, black glass sold as “French jet,” black coral, and onyx were all worn, according to the jewelry historians and dealers Rapaport interviewed; the Pitt Rivers Museum holds a gold mourning ring with hair set behind onyx.
Art Deco and after. In the Art Deco years, Sotheby’s notes, highly polished onyx became “a go-to gemstone for bold contrasts,” and the Cartier pieces it shows pair onyx with diamonds. It has stayed a fixture of men’s jewelry ever since, in cufflinks, signet rings, and statement rings.
Onyx in the Bible
Onyx appears in the Bible from its first chapters, but the word deserves a footnote. The Hebrew is shoham, which occurs 11 times in the Old Testament. The King James Version and most modern translations render it “onyx,” but translators have never agreed: older and newer versions use other stones, such as beryl, emerald, or carnelian (compare the translations), and the Brown-Driver-Briggs Hebrew lexicon calls the identification “dubious,” as Bible Hub shows.
The best-known passage is Exodus 28:9–12. Two onyx stones were set on the shoulders of the high priest’s ephod, each engraved with six names of the sons of Israel, so that Aaron would “bear their names before the LORD upon his two shoulders for a memorial.” Onyx also sits in the fourth row of the high priest’s breastplate (Exodus 28:20), and Genesis 2:12 places “the onyx stone” in the land of Havilah, on one of the rivers that flow out of Eden.
In Exodus, then, the stone carries names as a memorial. Whether it was the black chalcedony of a modern ring, no one can say for certain.
Birthstone, zodiac sign, and anniversary
July. Onyx is a traditional birthstone for July. George F. Kunz, the gem expert at Tiffany & Co., compared eight historical month lists in The Curious Lore of Precious Stones (1913), and onyx appears under July in five of them. The list American jewelers adopted in Kansas City in 1912, like the one in use today, gives July to ruby, so onyx is July’s traditional stone rather than its official one.
August. Sardonyx, onyx banded with red-brown sard, has been an August birthstone on the US list since 1912. GIA calls it the original August birthstone, now listed alongside peridot and spinel.
Zodiac. Kunz’s main table of zodiac stones gives onyx to Leo. Crystal sellers vary: the one we quote below pairs black onyx with Capricorn and Leo, and Lang Antiques lists Scorpio, Capricorn, and Leo.
Anniversary. GIA’s list of anniversary gemstones gives onyx to the seventh year, while noting that no single list is authoritative. The anniversary pairing is a modern convention: Kunz’s 1913 list gives the seventh year to flowers. An onyx ring for a July birthday, a Leo, or a seventh anniversary has a convention behind it; any other onyx ring needs no excuse.
What crystal sellers and astrologers say
Most of what you will read under “black onyx meaning” comes from crystal sellers. A typical listing calls it “a stone of protection and inner strength,” says it “absorbs and transmutes negative energy,” connects it to the root chakra, and recommends it for resilience, self-mastery, and discipline.
Astrology adds a planet. GIVA ties onyx to Saturn, or Shani in Vedic astrology, and calls it a grounding, steadying stone of discipline and patience rather than a stone for quick luck; Astroyogi assigns it to Mars and Saturn. The Saturn link is older than either site. In the planetary lore Kunz surveys, “far-away Saturn must be content with all dark, black, and brittle stones,” and the planet’s influence “was always regarded as baleful.”
None of this is a property of the stone. “There is no evidence that crystal healing works over and above a placebo effect,” the psychologist Christopher French told Live Science. In a study he presented in 2001, 80 people meditated holding either real quartz or fake crystals they believed were real, and both groups reported the same warmth in the hand and the same sense of well-being. If a meaning matters to you, it is a perfectly good reason to choose a stone; just give yourself, not the ring, the credit for the discipline.
| What it’s said to mean | Where the idea comes from | What we can say |
|---|---|---|
| Protection, strength, grounding | Where the idea comes fromModern crystal sellers | What we can sayA belief; no effect beyond placebo has been shown |
| Saturn’s stone | Where the idea comes fromAstrology sites; older planetary lore, as Kunz reports | What we can sayA tradition, not a property |
| Sadness, bad dreams, quarrels | Where the idea comes fromMedieval and Arabic lapidaries, as Kunz reports | What we can sayA belief, and the reverse of today’s |
| Cooling love | Where the idea comes fromGirolamo Cardano, 16th century, writing about India | What we can sayA belief |
| July, Leo, the seventh anniversary | Where the idea comes fromKunz’s tables (1913); GIA’s modern anniversary list | What we can sayGift conventions; the lists disagree |
| Names carried as a memorial | Where the idea comes fromExodus 28 | What we can sayScripture; which stone shoham was is uncertain |
Which finger for a black onyx ring?
Ask astrology sites and you will get different answers. GIVA recommends the middle finger of the right hand, the finger palmistry gives to Saturn (Mrs. J. B. Dale’s 1895 Indian Palmistry puts the mount of Saturn at its root), and adds that some astrologers prefer the ring finger. Astroyogi suggests the little finger of the left hand or the middle finger, depending on how you are advised.
As a matter of style, the answer is simpler. A statement onyx ring sits best on the ring finger or the middle finger of your right hand, leaving your left ring finger for a wedding band. A stone signet can go on the pinky, as the signet tradition allows. One onyx ring per hand is plenty. Our guides to which finger to wear a ring on and to wearing a signet ring go further.
Is black onyx bad luck?
It once had that reputation. A medieval lapidary passed off as Aristotle’s, which Kunz quotes, warns that whoever wears onyx “will have fearful dreams and be tormented by a multitude of doubts and apprehensions,” with “many disputes and lawsuits” besides. Kunz glosses its Arabic name, el jaza, as “sadness,” and reports an idea commonly associated with the stone, that it “provoked discord and separated lovers”; the red stone sard was worn to drive away the bad dreams and melancholy onyx was thought to bring. In the 16th century the Italian scholar Girolamo Cardano reported that people in India wore onyx to cool the ardor of love.
The same stone has had the opposite meaning, too. A dream list Kunz reprints says that dreaming of onyx foretells a happy marriage, and today’s sellers call it protective. A meaning that can flip from curse to charm says more about the people telling it than about the stone, and no evidence supports luck in either direction.
What a black onyx ring says today
On a man’s hand, black onyx reads less as a talisman than as a choice of contrast. Black against bright silver is one of the strongest contrasts in men’s jewelry, and it carries the stone’s real history with it: the Roman seal, the Art Deco evening, the signet. It looks deliberate without looking loud, and it goes with black, gray, navy, and denim as easily as with a suit.
If you choose one for its meaning, choose a meaning that is yours: a July birthday, a seventh anniversary, a reminder to keep your head. Then choose the ring for how you live. A stone held in a full frame suits a ring worn every day; prongs and raised stones give more presence and need more care. Our guide to black onyx rings covers settings, scratches, and cleaning, our guide to stone signet rings covers onyx signets, and our guide to wearing a ring with a suit covers the office and evenings out.
FAQ
What does black onyx symbolize?
In history, the Roman seal and cameo, Victorian mourning, and Art Deco contrast; in Exodus, the stones that carried the names of Israel’s tribes on the high priest’s shoulders. In crystal and astrology traditions, protection, strength, discipline, and Saturn. The history is documented; the powers are beliefs.
Is black onyx a birthstone?
Traditionally, for July: onyx appears under July in five of the eight historical lists Kunz compared in 1913. The modern US list gives July to ruby. Sardonyx, onyx banded with red-brown sard, is an official August birthstone.
What zodiac sign is black onyx for?
Leo, in Kunz’s 1913 table of zodiac stones. Some crystal sellers also pair it with Capricorn, and Lang Antiques adds Scorpio.
Which finger should a black onyx ring go on?
Astrology sites disagree: the middle finger, which palmistry gives to Saturn, the ring finger, or the little finger of the left hand. For style, wear a statement onyx ring on your right ring or middle finger, and an onyx signet on the pinky if you like.
Is black onyx bad luck?
No evidence says so. Medieval lapidaries blamed onyx for sadness, nightmares, and quarrels, a dream list Kunz reprints says dreaming of it means a happy marriage, and crystal sellers now call it protective. Luck isn’t a property of any stone.
Who should not wear black onyx?
Nothing about the stone itself is a reason to avoid it. Astrology sites say a birth chart decides, which is a belief. If your skin reacts to rings, check the metal, not the stone: our guides to whether 925 silver contains nickel and to green fingers and itchy skin explain why.
Is onyx in the Bible?
Yes. The Hebrew shoham is translated “onyx” in the King James Version: two onyx stones engraved with the names of the tribes sat on the high priest’s shoulders (Exodus 28:9–12), and onyx is in the fourth row of his breastplate. Translators still disagree about which stone shoham was.
What is the difference between onyx and black onyx?
Onyx is banded chalcedony, with straight layers of two or more colors. Black onyx is an even black chalcedony, almost always colored by a permanent treatment. Both are forms of quartz, about 7 on the Mohs scale.
Bottom line
Black onyx means what its history and its wearer make of it. The name is Greek for “fingernail,” the story runs from Roman seals through Victorian mourning to Art Deco, the old lists give it to July and to Leo, and modern anniversary lists give it the seventh year. The powers, good and bad, are beliefs that have flipped more than once. Choose a black onyx ring for its contrast and its history, choose the setting for how you live, and let the meaning be your own.
From the collection
Men’s sterling silver rings by Ronatelli
Eleven handmade 925 rings, $129 to $169, from a chain-link band to a black onyx statement ring. Every one is adjustable.
Related guides
History follows Pliny the Elder’s Natural History, Book 37 (sections 85 to 91); George F. Kunz’s The Curious Lore of Precious Stones (1913) for the birthstone and zodiac tables, the planetary, medieval, and Arabic lore, Cardano, the dream list, and the 1913 anniversary list; Sotheby’s “The A-Z of Jewelry: O is for Onyx”; the Kunsthistorisches Museum’s entry for the Gemma Augustea on Google Arts & Culture; and, for mourning jewelry, Rapaport’s “Fade to Black” (2011) and the Pitt Rivers Museum. The etymology follows the Online Etymology Dictionary. Bible passages are quoted from the King James Version, with the Hebrew and other translations compared on Bible Hub. Birthstones and the anniversary list follow GIA; zodiac attributions also follow Lang Antiques. Crystal and astrology claims are quoted from crystals.com, GIVA, and Astroyogi as examples, not endorsements; the crystal study is as reported by Live Science; palmistry follows Mrs. J. B. Dale’s Indian Palmistry (1895). Read our editorial policy.
