Heart Cut Moissanite: What to Check Before You Buy
The heart is the only cut where a buyer can spot a bad stone from across a table. Here is what symmetry, proportion and prong placement actually look like — and why the shape works better on a chain than on a finger.
Why the heart is the hardest shape to cut
A round brilliant is a body of revolution. You index it and the geometry repeats. A heart is not: it is a pear with a cleft cut into the wide end, so the cutter has to resolve two systems — a curved lobe on each side, a point at the bottom — and then make them agree.
Every other shape gives the cutter somewhere to hide. An oval can be slightly out of round and still read as an oval. A heart cannot be slightly out of true, because the eye goes straight to the cleft and compares one lobe against the other.
Symmetry: the two lobes must match
Fold a heart down its vertical axis and one half should land on the other. Four things to check:
- Equal lobe width. One lobe wider than the other is the most common defect and the easiest to see.
- Equal lobe height. Each shoulder should peak at the same distance from the cleft.
- A centred cleft. The V must sit exactly on the axis; an off-centre cleft drags the whole stone sideways.
- A straight tip. The point should sit directly below the cleft, not leaning left or right.
None of this needs equipment. Hold the stone at arm's length, close one eye, and look at the outline rather than the sparkle.
Length-to-width ratio: aim for 0.95 to 1.05
Hearts are measured like pears, but the target is tighter. Below about 0.95 the lobes flatten into a wide top; above about 1.05 the shape stretches into a spade and the point becomes a spike.
| Ratio (L ÷ W) | What it looks like |
| Under 0.90 | Squat; lobes look flattened, reads as a shield |
| 0.95 – 1.00 | The classic heart; full lobes, short point |
| 1.00 – 1.05 | Slightly elongated; elegant, still balanced |
| Over 1.10 | Narrow and spade-like; the point gets fragile |
Ask for the measurement rather than estimating it. Any supplier quoting dimensions in millimetres has already given you both numbers.
The point is the weak spot
A heart has one place where the girdle comes to a near-zero radius, and that tip chips. It is the most common repair on heart-cut jewelry, and it almost always happens because the point was left exposed in a setting that did not cover it. Either a V-prong cups the tip or a bezel follows the outline. A four-prong setting with the point hanging in open air is asking for a chip.
Prongs belong on the lobes, not the tip
The lobes carry the width and the mass, so a prong set into the curve of a lobe is structurally sound and visually invisible. A prong on the point is neither: it interrupts the silhouette exactly where the eye lands, and it puts pressure on the thinnest part of the girdle. The correct arrangement is two at the lobe shoulders, one at each side of the cleft, and a V-prong at the point.
How to check symmetry from directly above
- Place the stone face up on plain white paper under ordinary room light, not a spotlight.
- Look straight down. Any tilt hides asymmetry.
- Compare the lobes by width, then by height. Then check the cleft position, then the tip.
- Turn the stone 90 degrees and repeat. Right one way and wrong the other means out of true.
- Only then look at the sparkle.
Do the outline first and the brilliance second. Brilliance is the easiest thing to fake with lighting and the hardest thing to judge from a photograph.
What double refraction does to a heart
Moissanite is doubly refractive, so every ray entering the stone splits in two. In a round brilliant this is mostly invisible. In a shape with a long axis and a pointed end it becomes directional: facet edges can look slightly doubled off-axis, and the tip can appear softer than the rest of the outline.
This is a property of the material, not a defect. Under a loupe you will see doubled facet junctions; at normal viewing distance you will not.
Necklaces and earrings, not rings
The problem with a heart ring is that the shape has a top and a bottom, and a ring rotates on the finger. Within an hour the point has swung to one side and the heart is lying on its shoulder.
On a chain, the pendant hangs from the cleft and gravity keeps it upright. In a stud or drop, the stone is fixed to the ear and does not spin. If you want a heart ring anyway, choose a bezel or a wide setting that locks the orientation, and accept that you will still straighten it.
What we make
Our heart cut moissanite is cut in our own factory in Wuzhou, Guangxi, which has been running since 2008. Stones are D colour, VVS1, and ship with a GRA certificate. We set hearts as pendants and studs far more often than as rings, for the reason above — the shape needs a fixed orientation to stay upright.
Pieces run from $17 to $2,020, median around $98, in 925 sterling silver, 9K, 14K and 18K gold. Free shipping over $99; $5.99 below. Returns within 30 days on unworn pieces in original packaging.
