Six shapes, three things that actually differ: how big the stone looks for its weight, where it is structurally weak, and whether it shows a dark bow-tie. Everything else is taste, and taste does not need a guide.
One note on sources before the detail. The shape references below are from GIA and Charles & Colvard, and they describe diamonds. They carry over to moissanite because face-up spread, bow-ties and vulnerable points are functions of geometry and cutting, not of what the stone is made of. Where hardness is the issue, this article uses moissanite's own figure rather than a diamond's.
The Six at a Glance
| Shape | Outline | Looks big for its weight? | Setting / outline check |
|---|---|---|---|
| Marquise | Elongated, pointed at both ends | Most of any shape | Two points |
| Oval | Elongated, no corners | Yes — clearly | No pointed end |
| Pear | Round at one end, pointed at the other | Yes | One point |
| Radiant | Rectangular, trimmed corners | Yes, from the rectangle | Corners are already trimmed |
| Princess | Square, sharp corners | More than round | Four sharp corners |
| Cushion | Square-to-rectangular, rounded corners | Depends on the ratio | Rounded corners |
Read that third column first if you are choosing on budget, and the fourth if you wear rings hard.
Which One Looks Biggest for the Money
Carat is weight, not size. Two stones of identical weight can present very different amounts of surface to the person looking at your hand, and the difference is not small.
Charles & Colvard's shape comparison ranks it directly. Marquise leads: it "typically looks the largest per carat", because its "elongated, boat-shaped cut" with "pointed ends" gives it "a larger face-up surface area."
Oval is another strong choice, and this is the one figure worth remembering from the whole article: an oval has "approximately 10% larger face-up appearance than round diamonds of equal weight."
Pear also has "an excellent size appearance for its carat weight" from its "elongated form" and "tapered end." Radiant gains from its "rectangular shape" providing "more surface area." Princess offers "a larger face-up appearance than round diamonds." Cushion's face-up appearance varies with its length-to-width ratio.
And round, the shape most people default to, is at the bottom: rounds "have smaller face-up appearances than fancy shapes of the same carat weight."
The practical version: if presence per dollar is what you are after, an elongated shape gets you there at a lower carat weight than a round does. Our moissanite size chart gives the mm-to-carat conversions if you want to work in millimetres instead, which is the more honest unit for this question.
The Bow-Tie: The Flaw Nobody Warns You About
Some popular elongated shapes can show a specific feature that does not always reveal itself in a small product photo.
GIA describes it as "a dark area which looks like two triangular pieces joined in the center of the stone", and names the shapes it affects: oval, marquise, pear and heart. The guidance is simple — when you look at the stone face-up, "you want the 'bow-tie' to be minimised as much as possible."
Two things follow from that.
- Marquise, oval and pear appear in both discussions. They can offer strong face-up size while also appearing on GIA's bow-tie list. The overlap is a reason to inspect the individual stone, not evidence that one feature causes the other.
- Use the actual stone photo. GIA's guidance is to assess the stone face-up and minimize the bow-tie. A shape chart cannot tell you how visible that feature is in a particular stone.
Princess, radiant and cushion are not on GIA's bow-tie list.
Where Each Shape Is Fragile
Moissanite is hard — 9.25 on the Mohs scale, per Charles & Colvard, against diamond's 10 per GIA. But hardness resists scratching, and that is a different property from resisting a knock. A sharp point is a sharp point whatever the material.
GIA's advice on the pointed shapes is specific and it is about the setting, not the stone:
- Marquise — if a prong mounting is chosen, "V-shaped prongs will help protect the points."
- Pear — include "a V-shaped prong at the point because that will help protect it from damage."
- Triangular shapes — protection is "recommended to keep the sharp points from chipping."
Princess and radiant invite a different visual comparison. Princess has pointed corners, while radiant has trimmed corners. The GIA guidance cited above gives specific protective-prong advice for marquise and pear; it does not establish a durability ranking across all six shapes.
Oval has no pointed end, while cushion has rounded corners. If you prefer those outlines, compare the actual setting as well as the shape.
Length-to-Width: The Number That Decides the Look
Within one shape, the ratio of length to width changes the look more than the shape name does. A 1.3 oval reads almost round; a 1.7 oval reads distinctly long. GIA's recommended ranges:
| Shape | Length-to-width ratio |
|---|---|
| Oval | 1.33–1.66 : 1 |
| Marquise | 1.75–2.25 : 1 |
| Pear | 1.50–1.75 : 1 |
| Heart | approximately 1.00 : 1 |
| Triangular | 1.00 : 1 |
These are not rules; they are the ranges GIA lists for the shapes above. A stone outside a listed range may simply look more round or more stretched, so check the actual dimensions and decide whether that outline is the one you want.
Ratios are not always printed on product pages. When a listing gives both millimetre measurements, divide the length by the width to calculate the ratio. If either measurement is missing, ask for it before treating the shape name alone as enough information.
Which Shape Should You Actually Buy?
| If this is you… | Shape | Why |
|---|---|---|
| Want maximum size for the carat weight | Marquise, oval, or pear | All are elongated; C&C identifies marquise as the largest per carat and reports a larger face-up appearance for oval and pear than round |
| Want an elongated outline without a pointed end | Oval | Oval has an elongated outline and no pointed end |
| You work with your hands | Any shape with a setting you have inspected | For marquise and pear, GIA specifically recommends V-shaped prongs at the points |
| Set on a square look | Compare radiant and princess | Princess has pointed corners; radiant has trimmed corners |
| Want a softer, less angular look | Cushion | Rounded corners; ratio decides how square or elongated it reads |
| Want something distinctive | Marquise or pear | Both have a distinctive pointed outline; for the points, GIA recommends V-shaped prongs |
| Buying online and cannot inspect the stone | Princess, radiant or cushion | Not among the shapes GIA identifies for bow-ties, so there is one fewer shape-specific issue to assess from a photo |
That last row is the one most buying guides skip. If you cannot see the stone in person and the listing photo is small, choosing a shape outside GIA's bow-tie guidance removes one shape-specific risk that a specification list may not reveal.
The Short Version
Choose marquise when maximum face-up presence matters most and you are comfortable protecting two points. Choose oval when you want the elongated look with no pointed end. Choose pear for asymmetry, radiant for an angular outline with trimmed corners, princess only when the square look is worth protecting four corners, and cushion when you prefer a softer outline.
The best shape is not the one with the highest visual-size claim. It is the one whose outline, setting needs, and actual stone photo still make sense for how you will wear it.
FAQ
Which moissanite shape looks the biggest?
Charles & Colvard identifies marquise as typically looking the largest per carat. Oval is reported to have an approximately 10% larger face-up appearance than a round of equal weight, while pear also has an excellent size appearance for its carat weight.
What is the bow-tie effect?
A dark area across the centre of a stone that GIA describes as looking like two triangular pieces joined in the middle. It affects oval, marquise, pear and heart shapes, and you want it as minimal as possible.
Which moissanite shape is most durable?
This guide does not rank the six shapes for durability. GIA specifically recommends V-shaped prongs to protect marquise and pear points; for any shape, inspect the setting and ask how it protects the stone's outline.
Do marquise and pear shapes chip easily?
Their points are the vulnerable part. GIA's guidance is to use V-shaped prongs at the point, which is a setting decision rather than a reason to avoid the shape.
Is princess cut a bad choice?
No. Princess has pointed corners, while radiant has trimmed corners; choose between them based on the outline you prefer and inspect the setting that will hold the stone.
What length-to-width ratio should I look for?
GIA's recommended ranges are 1.33–1.66 for oval, 1.75–2.25 for marquise and 1.50–1.75 for pear. Outside those, the stone usually reads either too round or too stretched.
Does the shape change how much a moissanite sparkles?
Shape changes how the light is broken up and where it comes back, but the optical properties of the material are the same in every shape. Our guide to why moissanite sparkles more than diamond covers what is actually happening.
Which shape is cheapest?
Pricing varies by the seller, stone dimensions, color, cut quality, and setting. Compare the actual listings you are considering rather than assuming one shape will always cost less.
Keep Reading
- Emerald Cut Moissanite: Why Step Cuts Look Different
- Moissanite Size Chart: mm to Carat (With Real Size Comparison)
- Why Does Moissanite Sparkle More Than Diamond? (The Real Science)
Know your shape? Browse the Oglowa moissanite collection and compare each listing's available stone measurements and photos before choosing.
