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Ask what a heart means in jewelry and the answer seems almost insultingly obvious. Love of course. Next question.

Except... why?

A human heart doesn’t look much like the neat little shape we draw on Valentine’s cards, and there is nothing inherently romantic about an organ whose main responsibility is keeping you alive. Yet somewhere along the way, the heart became one of the most recognizable ways to say I love you without saying anything at all.

And hearts aren’t the only symbols we accept without much questioning. Knots suggest bonds, commitment, and two lives becoming intertwined. Keys can represent trust, access, devotion, and, of course, that wonderfully unsubtle idea of giving someone the “key to your heart.” We know what these symbols are supposed to mean. Most of us just never stop to ask who gave them those meanings in the first place.

That is where things get more interesting. The meanings attached to hearts, knots, and keys did not all appear at the same time, come from the same culture, or remain unchanged throughout history. Some associations developed gradually through art, religion, courtship, marriage, literature, and jewelry itself. Others became much more romantic only later.

So yes, a heart means love. You already knew that. The better question is how a stylized organ, a tangled piece of cord, and something originally designed to open a lock became three of jewelry’s most enduring ways to talk about love.

Why Did the Heart Become a Symbol of Love?

The strange thing about the heart symbol is that its romantic meaning began long before anyone needed the familiar little ♥ shape to explain it. People had already spent centuries treating the physical heart as something more than a pump.

Long before the familiar heart shape became shorthand for romance, people were already using the heart and the inner body to talk about emotion and human experience. Ancient Greek literature, for example, used language associated with the heart, mind, and inner self to describe feelings, desires, thoughts, and motivations.

The Greeks did not hand us a neat little equation saying heart = romantic love. History is rarely that cooperative. But the larger idea was already taking shape: important feelings were imagined as something happening deep inside you.

By the Middle Ages, European art and literature could take the connection between hearts and love and make it wonderfully literal. Lovers could give away their hearts, have their hearts wounded, or speak of belonging to someone “with all my heart.”

One German love casket from around 1325–1350 practically turns romance into combat. The personification of Love aims an arrow at a young man, while another scene shows him presenting his heart to her. The inscriptions speak of surrender and a wounded heart. Medieval romance, apparently, was not afraid of a little drama.

And that helps explain why the heart became such a natural symbol for romantic love. If love was something imagined as affecting the heart, wounding the heart, filling the heart, or causing someone to give their heart away, eventually the heart itself could stand in for the whole complicated emotion.

The shape we recognize today would develop and become standardized over time, but the deeper idea came first. The heart was not chosen simply because it happened to look romantic. It became romantic because generations of people had already been using the heart as a way to talk about what was happening inside them.

Which, when you think about it, is a pretty impressive career change for an organ.

How Did the Heart Find Its Way Into Love Jewelry?

Once the heart had become a useful way to talk about love, putting that idea into jewelry was almost inevitable. Jewelry already had everything romance needed: it was personal, portable, valuable, and small enough to carry a message that might mean far more to the wearer than to anyone looking at it.

Medieval jewelry shows just how literal those messages could become.

A German gold brooch made around 1340–1360 depicts a man holding arrows aimed toward his heart. Hidden inside is an inscription asking a lady that he may always remain close to her heart. The Metropolitan Museum of Art describes the piece as expressing the medieval chivalric ideal of love. In other words, the heart was no longer merely something poets complained about. It had made the jump into jewelry.

Rings could be even more direct. Medieval posy rings, named for the poetic inscriptions they carried, were engraved with short messages of affection, friendship, devotion, and love. One surviving gold ring from around 1400–1450 is decorated with little hearts and carries the French message pense de moy, or “think of me.”

That is surprisingly relatable for something made more than five centuries before the text message.

Another 13th-century gold ring in the British Museum announces itself as a love token and instructs the recipient not to give it away. Its design also includes a pair of clasped hands, which the museum identifies as symbols of love and trust. Apparently medieval romance was capable of being both sentimental and slightly possessive.

What makes these pieces especially interesting is that love jewelry did not depend on the heart symbol alone. Hearts appeared alongside inscriptions, clasped hands, initials, flowers, religious imagery, and other devices that could make a piece feel personal to the people exchanging it. Jewelry was becoming a kind of wearable language.

And the heart was exceptionally good at that job. It could communicate affection without requiring a long inscription, and as its shape became increasingly recognizable, the symbol itself could carry the message.

That basic idea has survived remarkably well. A heart pendant given today may look nothing like a medieval brooch or posy ring, but the gesture behind it would probably make perfect sense to the people who wore those objects centuries ago: this little thing represents something I feel for you.

Human beings, it turns out, have been finding ways to make jewelry say the awkward emotional stuff for us for a very long time.

Why Did Knots Become Symbols of Love and Commitment?

When jewelry talks about knots, we’re not talking about the kind you accidentally create in a shoelace or necklace chain and immediately regret.

The romantic appeal of a knot is much easier to understand when you look at what a knot actually does. It joins separate things together. It binds. It holds. And if it is tied particularly well, getting those things apart again can become quite a project.

As metaphors go, humans did not exactly have to work very hard with this one.

Historical jewelry gives us real examples of knots appearing in a romantic context. A 15th-century gold ring in the British Museum has a figure-eight knot worked into the back of the hoop, along with an emerald and an inscription inside the band. The museum identifies it as a possible love ring.

Later marriage jewelry made the idea of joining two things together even more literal. Renaissance gimmel rings were constructed from two or more interlocking hoops that could separate and then fit together as one ring. A 16th-century example at The Metropolitan Museum of Art consists of two interlaced gold hoops and bears an inscription translating to “Those whom God hath joined together let no man put asunder.” The Met notes that this type of ring was commonly used as a wedding band during the Renaissance.

That is about as committed to the metaphor as jewelry can get. Two separate pieces become one, and then the ring basically includes written instructions not to separate them again.

Knots and interlaced forms are therefore easy to understand as symbols of attachment, loyalty, marriage, or enduring connection. A strand that appears to continue without an obvious stopping point practically invites comparisons with lasting bonds.

And this is where Celtic knotwork naturally enters the conversation.

Interlace and knotwork are prominent features of early medieval Irish art, appearing in manuscripts, metalwork, and stone sculpture. The National Museum of Ireland, for example, describes interlace, knotwork, and spirals as decorative techniques used by early medieval Irish craftspeople on manuscripts, fine metalwork, and high crosses.

It is easy to see why those interwoven patterns feel so compatible with modern ideas about connection and lasting relationships. But that raises a much trickier question: were Celtic knots actually understood as symbols of love by the people who originally made them?

Did Celtic Knots Always Mean Love?

Here is where Celtic knot symbolism gets a little messier than the internet sometimes makes it sound.

Early medieval Irish and Insular art absolutely did use elaborate interlace. Craftspeople covered manuscripts, metalwork, and stone monuments with strands that weave over and under one another, sometimes forming astonishingly complex patterns. The National Museum of Ireland’s Banagher Cross Shaft, dating to around AD 800, includes single-strand and two-strand interlace, animal interlace, spirals, and human figures physically connected by interlacing bands.

And then there is the Book of Kells, created around AD 800 and filled with extraordinarily elaborate abstract, animal, plant, and human ornament. Trinity College Dublin explains that its decoration helped glorify the Christian text and keep religious imagery and symbols before the reader.

What history does not hand us quite so conveniently is a medieval instruction manual saying: This knot means eternal love. That knot means family. And this one is for the person you met three weeks ago but already have a matching tattoo with.

The surviving art is real. The craftsmanship is real. But assigning one fixed romantic meaning to every individual knot pattern is often a much more modern practice.

That does not make those meanings worthless. Symbols continue to acquire new associations long after they are first created. A continuous interlaced design is especially easy to read as a symbol of connection because one strand can appear to flow into the next, weaving together without an obvious beginning or end. In modern Celtic-inspired jewelry, that visual idea lends itself naturally to love, loyalty, friendship, family, and lasting bonds.

View the featured Triple Celtic Knotwork Heart Silver Pendant

The distinction is simply worth making: a modern symbolic meaning is not automatically an ancient documented meaning.

Even the term “Celtic” covers a much broader artistic story than many modern jewelry descriptions suggest. Celtic art developed across different places and periods, while the spectacular interlace associated today with Irish and Celtic design became particularly prominent in the early medieval art of Ireland and Britain. Scholars continue to study where those interlace traditions came from and how they developed rather than treating them as one unchanged symbolic system stretching back through all Celtic history.

So if someone gives you a Celtic knot pendant and says it represents an unbreakable bond, you do not need to push the jewelry back across the table and demand archaeological documentation.

It can mean that now.

We just should not put words into the mouths of people who lived a thousand years ago simply because the symbolism fits beautifully today.

Why Did Keys Become Romantic Symbols?

Compared with hearts and knots, a key seems like a slightly odd candidate for romance. Its original purpose is practical: it opens something that is locked. Not exactly poetry.

But that practical function is also what makes the symbolism work so well. A key grants access to something that is otherwise closed. Give that idea an emotional setting and it can suggest trust, intimacy, possession, secrecy, or being allowed into a part of someone’s life that is not open to everyone.

Humans, naturally, took it from there.

One remarkable late-medieval example already combines a lock with an unmistakably romantic message. A small gold padlock locket from the Fishpool Hoard, dated to about 1400–1464, still has its tiny key attached by a chain. Engraved across the two sides are the French words de tout mon cuer, meaning “with all my heart.”

Think about what that object is doing. It is a lock. It has a key. And it is literally telling someone, “with all my heart.” Medieval jewelry occasionally had the subtlety of a handwritten note tied to a brick.

By the 19th century, the idea became even more explicit. An English heart-shaped padlock jewel made around 1840 came with its own key, and the Victoria and Albert Museum identifies the lock-and-key design with the convention that the recipient possesses the “key to my heart.” The jewel goes several romantic steps further: gemstones were arranged so their initials spell REGARD, and opening the heart reveals woven hair preserved beneath glass.

Apparently one romantic message was not enough. This thing brought backup.

That combination helps explain why keys became such effective symbols in sentimental jewelry. A heart expresses the feeling itself. A knot can suggest two things joined together. A key introduces another idea: I am letting you in.

Modern key jewelry can carry many meanings beyond romance, including opportunity, freedom, knowledge, or opening a new chapter. But when a key appears beside a heart, the romantic interpretation hardly needs an instruction manual anymore.

And yet, once again, what feels obvious today has a history behind it. The “key to my heart” was not simply a cute phrase dreamed up for modern necklaces. Surviving jewelry shows that people were playing with the relationship between hearts, locks, keys, and affection centuries ago.

What Do Hearts, Knots, and Keys Mean in Jewelry Today?

After all that history, the modern meanings of these symbols are surprisingly easy to recognize. That is probably why they have survived so well. You do not need to know anything about medieval brooches, Renaissance wedding rings, or Victorian hair jewelry to understand what a heart pendant is trying to say.

But each symbol speaks a slightly different emotional language.

Hearts remain the most direct. They usually express love, affection, romance, or emotional closeness. Depending on who gives the piece and why, that love might be romantic, familial, or simply deeply personal. The heart does not really need much explanation anymore. It has spent centuries doing the branding.

The Claddagh takes that heart symbolism a step further by combining it with hands and a crown, creating a design associated today with love, friendship, and loyalty.

The question of who invented the Claddagh ring is another story entirely, and the historical evidence is less tidy than the traditional Richard Joyce legend suggests.

Knots tend to suggest connection. Their interwoven structure makes them especially suited to ideas such as commitment, loyalty, friendship, family, and relationships meant to endure. In Celtic-inspired jewelry, continuous knotwork is often interpreted today as representing lasting bonds or interconnected lives, even when that exact meaning cannot be traced to a specific ancient source.

Keys are a little more flexible. In romantic jewelry, a key can still suggest trust, intimacy, or being given access to someone’s heart. Outside romance, it might represent opportunity, independence, knowledge, a new beginning, or the idea of unlocking something that was previously out of reach.

And the symbols can change again when they are combined.

A heart with a key can make the romantic message almost comically clear. A heart woven into Celtic knotwork can suggest affection strengthened by connection or commitment. A knot surrounding another symbol can visually bind those ideas together, giving the piece a meaning that is more personal than any single symbol on its own.

The Claddagh ring is another good example: it combines a heart, hands, and crown, and the way a Claddagh ring is worn can add yet another traditional layer of meaning.

That is one of the reasons symbolic jewelry continues to appeal to people. The meaning is not always dictated by a historical rulebook. History gives the symbols context, but the wearer still gets the final word.

A heart might commemorate a partner. A Celtic knot might remind someone of family. A key might mark the moment someone finally bought their own home, started over, or simply decided that the necklace looked fantastic and did not require a philosophical explanation.

That counts too.

Jewelry can carry centuries of symbolism without requiring the person wearing it to carry centuries of homework.

Why These Symbols Still Matter

So yes, a heart means love. We knew that going in.

What we tend to forget is that none of these meanings arrived fully formed. Hearts, knots, and keys became meaningful because generations of people kept using familiar objects and shapes to say things that were harder to put into words.

Those meanings did not remain perfectly fixed, either. People kept adding to them, reshaping them, and sometimes giving old designs entirely new interpretations. Celtic knotwork is a good example: the interlace itself has deep historical roots, while many of the precise romantic meanings attached to individual patterns today are considerably newer.

And maybe that is part of what makes symbolic jewelry interesting. A piece can carry history without being trapped by it.

We may barely think about these symbols when we see them anymore. They feel obvious.

But “obvious” is often just what happens when a meaning has been repeated for so long that we forget somebody had to give it meaning in the first place.

Frequently Asked Questions

Were hearts always symbols of romantic love?

No. The heart carried important meanings long before it became one of romance’s favorite symbols. In ancient Egypt, for example, the heart was associated with intelligence, feelings, memory, actions, and a person’s inner character. Heart amulets could also serve protective and funerary purposes. That is quite a different assignment from helping someone through Valentine’s Day.

Is a love knot the same thing as a Celtic knot?

No. “Love knot” is a broad romantic term that can be applied to knotted or interlaced jewelry designs from different traditions. Celtic knotwork refers more specifically to interlaced patterns associated today with Celtic-inspired design and with historical Insular and early medieval Irish art. A Celtic knot can certainly be used as a love knot today, but the two terms are not automatically interchangeable.

Are all endless Celtic knots ancient symbols of eternity?

No. The continuous appearance of interlace makes eternity, continuity, and lasting connection very natural modern interpretations, but that does not mean every historical knot pattern was originally assigned one of those meanings. Early medieval Irish and Insular art contains extensive interlace, yet surviving objects do not provide a convenient dictionary explaining each design as a separate symbol of love, family, eternity, or friendship.

Were lock-and-key love jewels around before the Victorian era?

Yes. The romantic combination of locks, keys, and hearts predates Victorian sentimental jewelry by centuries. The gold padlock locket from the Fishpool Hoard, dated to about 1400–1464, still has its tiny key attached and carries the French phrase de tout mon cuer, or “with all my heart.” So the basic idea was already doing quite well for itself in the Middle Ages.

Why did people put hair inside heart lockets?

Hair could serve as an intensely personal keepsake because it was a physical part of someone that could be preserved long after a separation or death. Locks or woven arrangements of hair appeared in sentimental and mourning jewelry, sometimes hidden inside lockets alongside portraits, inscriptions, or other private reminders. A heart-shaped locket containing hair could therefore represent love, remembrance, grief, or some combination of all three.

Does heart jewelry always have to be romantic?

Not at all. A heart can represent romantic love, but it can just as easily stand for affection between family members, remembrance, friendship, or something personally meaningful to the wearer. Historical heart-shaped jewelry was not exclusively romantic either; hearts also appeared in mourning and remembrance jewelry.

That flexibility is probably one reason the heart has lasted so long. It is specific enough that nearly everyone recognizes the emotional idea, but broad enough that the person wearing it still gets to decide exactly whose heart, what kind of love, and whether anyone else needs to know.