What Is a Heart Shaped Diamond? The Complete Guide

A heart has more distinct parts than most fancy shapes, and every one of them has to be right for the outline to read as a heart rather than a lopsided teardrop. The quickest mental model is a pear shape with a cleft carved into its rounded top, splitting that single curve into two lobes. Here are the parts worth knowing by name, because they are exactly what you inspect when you look at one of the heart shaped Lab Grown Diamonds we set.

Read those five parts as one system. When the lobes, cleft, wings, and point are balanced around a single vertical line, the eye sees a clean heart. When any one of them drifts, the whole outline looks off, which is why the next section matters more than any other single factor.

If you remember one thing about buying a heart, make it this: symmetry is the whole game. A heart is the one common cut where a small flaw in balance is instantly visible to an untrained eye, because everyone already knows what a heart is supposed to look like. Nobody carries a mental template for a perfect radiant, but everybody does for a heart, so an uneven one reads as wrong even to someone who knows nothing about diamonds.

The test is simple. Draw an imaginary line straight down from the cleft to the point, then check that the two halves mirror each other. Three things have to line up:

Here is the practical catch: like most fancy shapes, a heart usually carries no overall cut grade from the labs, so a report will confirm the shape but will not hand you a single score for how well balanced it is. That means you judge symmetry with your own eyes, ideally on a magnified video or the stone in hand, not by trusting a grade. Compare the left half to the right half directly. If they match, you have a good heart. If they do not, no size or color will save it.

The second thing to check is the bow-tie. Like other brilliant cuts that are stretched along one axis (the oval, the pear, and the marquise), a heart can show a dark shadow across its middle shaped roughly like a bow tie. It happens where the facets let light pass straight through the stone instead of bouncing it back to your eye, leaving a shaded band at the widest part.

Every stone in this family has some bow-tie, so the question is degree, not presence. A faint one is normal and can even add pleasing contrast to the sparkle. A heavy one looks like a dead grey zone sitting in the center of the stone, and it does not go away. No number on the grading report captures it, because it comes from how the individual stone was cut, so the only reliable way to judge it is to look: tilt the stone or the video under light and watch whether that central band stays dark or breaks up into sparkle as the stone moves.

The proportion that sets a heart's character is its length-to-width ratio. Take the length and the width in millimeters from the report and divide the length by the width. A classic, balanced heart lands near 1.0, roughly 0.90 to 1.10, so the stone is about as tall as it is wide. That is the ratio most people picture when they think of the shape.

Move away from 1.0 and the look changes. Above about 1.10 the heart reads taller and narrower, which can look elegant but starts to lose the plump, unmistakable heart silhouette. Below about 0.90 it reads wide and full, bordering on squat. None of these is a defect, and none of it is a grade; it is taste. The important point is that a heart faces up about as broad as it is long, so unlike a pear or an oval it does not lengthen the finger. It reads full and bold instead, which is part of its appeal.

A heart packs three features into one outline: two lobes, a cleft, and a point. All three need physical room for the eye to read them, which is why size matters more here than it does for a simple round or cushion. Below about 0.50 carat, especially in a ring viewed at arm's length, the cleft tends to close up and the whole stone can read like a round or an indistinct blob. The heart is there, but nobody across a table can tell.

At about 0.50 carat and up the shape becomes unmistakable, and many buyers step up to 0.75 or 1 carat for an engagement ring so the outline is obvious at a glance. In pendants and earrings you can usually go a little smaller, because those are seen closer and the shape faces less scrutiny. And since a heart wears its weight as breadth rather than length, size shows up as a fuller, bolder face on the hand. For how different outlines carry their carat weight on the finger, see our guide to which diamond shape looks biggest.

A diamond is the hardest natural material there is (Mohs 10), but hardness is not toughness. Any sharp point concentrates stress, so the tip at the base of a heart is the one spot most likely to chip if the stone takes a knock. A good setting exists partly to solve that, and it is not an afterthought on this shape.

The standard fix is a V-prong, sometimes called a chevron prong, a small metal shield shaped to wrap around the point and cover it from both sides. A common arrangement is five prongs: one on each lobe, one on each wing, and the V-prong cradling the base. For an active hand, a bezel or half-bezel that rings the point in a continuous band of metal is the most protective option of all. Whichever style you choose, two rules hold: the point must be covered, and the cleft should either sit cleanly under a prong or be left open, never jammed with a prong that fights the shape. Setting is where the heart's beauty and its durability get decided at the same time.

Put the pieces together and choosing a heart becomes a short, ordered checklist. Work down it in this order, because the earlier items matter more than the later ones.

One grading note is worth knowing if you are buying a Lab Grown Diamond. IGI and GCAL still issue full 4C-style reports for Lab Grown Diamonds, while GIA has graded them on Premium and Standard descriptive tiers since October 1, 2025 (Source: GIA, 2025-10-01). The cut is about the shape, not the origin, so read the geometry off the report either way.

The heart is the most literal romantic shape in the catalog, so it suits someone who wants the meaning to be unmistakable rather than implied. It is a love piece, chosen for what it says, not for any notion of resale value, and it wears that intent openly. It reads full, warm, and bold rather than long and understated, which makes it a natural fit for a buyer who wants the ring to be noticed and personal. It is also uncommon, so you will rarely see the same shape on the next hand.

It is worth saying that the heart is not only an engagement shape. It works beautifully in pendants and earrings, where it can go a little smaller and still read clearly, and it makes an obvious choice for anniversaries and other milestones where the symbolism is the point. If you are still weighing it against other outlines, the full diamond shapes guide lays every common shape side by side so you can compare the heart to the rounds, ovals, and pears on even terms.

Stienhardt is a New York City jeweler that sources Lab Grown Diamonds and hand-sets and finishes them in NYC, selling direct to consumer, with viewings by appointment. A Lab Grown Diamond is a real diamond, identical in material and hardness to a mined one, so a heart shaped Lab Grown Diamond is a real diamond cut into a heart, no asterisk needed.

Because we own and inspect every stone we sell rather than drop-ship it, we can be exact about the things that make or break a heart: we check the symmetry ourselves, we hand you the independent grading report behind the stone, and we set the point so it is protected. If you take one habit from this guide, take that one. Confirm the symmetry, read the report, and make sure the setting covers the point, on our stones or anyone's.

If you would rather judge a stone in person, we show by appointment in New York. Book a viewing.