Cut registry › Jewellery cuts › Baguette
Jewellery cuts · Step cut
Fourteen facets, and no more.
A baguette does not sparkle, and the reason is arithmetic rather than craftsmanship. It is the clearest demonstration on this site of what facet count alone is worth.
The short version
A baguette diamond is a small rectangular step cut with 14 facets, used almost entirely as an accent stone rather than as a centre stone.
Fourteen facets is the second-lowest count of any cut we measure, behind only the triangle, and it explains nearly everything about how a baguette behaves.
Definition
A baguette is a step cut stripped back to almost nothing: a rectangular table, a few long parallel facets on the crown and pavilion, and square uncut corners. There are no triangles, no kites, and no scatter. Light arrives, reflects off a large flat plane, and leaves.
That produces broad, slow, mirror-like flashes rather than sparkle. Set in a row, straight baguettes read as a continuous sheet of mirrored light, which is the effect that made them central to Art Deco design and to channel settings ever since.
Straight and tapered are the two forms, and they do different jobs. A straight baguette is a true rectangle with parallel sides. A tapered baguette narrows toward one short end, and is set with its wide end against the centre stone so that its flashes angle inward. A row of straight baguettes reads as a band of light; a pair of tapered ones reads as a frame.
With so few and such large facets there is nowhere for an inclusion or a tint to hide. Small size helps in practice, since a two-millimetre stone shows less of anything, but the principle holds: a baguette is the least forgiving cut in the group on clarity and colour.
Proportions
Commonly cited ranges against our measured reference stone. A baguette is bought by millimetre rather than by carat in almost every case, since it is nearly always an accent.
| Measure | Commonly cited | Our reference stone | What it does |
|---|---|---|---|
| Length-to-width | 1.50 to 2.50; around 2.00 typical | 1.97 | Longer baguettes suit channels, shorter ones suit clusters. |
| Depth | 60% to 70% | 66.8% | The flat top, as a share of the width. |
| Table | 60% to 70% | 60.3% | Very large relative to the stone, as on any step cut. |
| Pavilion angle | not commonly published | 50.3° | Decides whether light returns or escapes. |
| Facets | 14 | 25 | Counted as facets that actually reach the surface. |
GIA issues no cut-quality grade for baguettes, and most are too small to be individually certified in any case. They are usually bought as calibrated goods, matched to a millimetre size and a colour and clarity range rather than graded one by one.
Light
Measured on the census that runs on every cut on this site: 3,200 rays face-up, 2,200 at 20° tilt, on exact facet geometry, against T57 as the standard.
| Material | Useful light | Leak | Fire | Scintillation | Global | vs the standard |
|---|---|---|---|---|---|---|
| Diamond | 40.43% | 38.00% | 62.11 | 42.62 | 56.56 | −32.05 |
| Moissanite | 32.22% | 42.01% | 74.90 | 42.62 | 55.92 | −33.90 |
| Cubic zirconia | 45.89% | 37.87% | 80.52 | 42.62 | 59.37 | −32.40 |
| T57 standard, diamond | 92.28% | 1.88% | 78.85 | 71.82 | 88.61 | 0.00 |
Here is the number this page exists for. Our reference baguette carries 25 active facets against the round-brilliant standard’s 57, and scores 42.62 on scintillation against 71.82.
Scintillation on this engine is a pure function of facet count and nothing else. It is 100(1−e−n/45), where n is the number of facets that actually reach the surface. So the gap between a baguette and a round brilliant on that axis is not a judgement about cutting quality or proportion. It is arithmetic.
A baguette does not sparkle because there is nothing there to sparkle with. That is not a criticism of the cut. It is the design: fourteen large flat planes produce a small number of large flashes, which is exactly what a channel of baguettes is meant to do.
Its light return follows the same logic. The baguette sends 40.43% of entering light back usefully and leaks 38.00%, for 56.56 Global against 88.61. It is the lowest score of the twenty-one jewellery cuts we measure, and it is the only one where that result is the point of the design rather than a compromise in it.
Variants
The library carries a second rectangular step cut, shorter and much more heavily faceted than the classic straight baguette above. Both are sold as baguettes.
| Geometry | Facets | Useful light | Leak | Fire | Global | What differs |
|---|---|---|---|---|---|---|
| Baguette on this page | 25 | 40.43% | 38.00% | 62.11 | 56.56 | The reference stone every other figure here describes. |
| Rectangle | 45 | 50.20% | 32.32% | 77.08 | 69.23 | A shorter, far more heavily faceted baguette. Nearly twice the facets, and it shows. |
This is the scintillation law again, from the other direction: nearly twice the facets buys a large jump in sparkle and a large jump in Global. If a baguette looks livelier than you expected, this is usually why. That stone has its own page.
Against the standard
Facet count. 25 against 57. Every other difference on this list follows from that one.
Sparkle. 42.62 against 71.82 on scintillation, the largest gap on this site. A baguette flashes; a round brilliant sparkles. They are doing different things.
Light return. 40.43% against 92.28%.
Clarity and colour. A round brilliant’s faceting scatters light and hides a great deal. A baguette hides nothing, so it wants a cleaner and whiter stone than its size alone would suggest.
Durability. Square, uncut, unprotected corners. This is the most fragile outline in the group, which is part of why channel and bezel settings became the standard way to use them.
Price. Considerably less per carat than a round, and almost always bought in calibrated parcels rather than singly.
The baseline for all of this is the round brilliant itself. Its facet plan is set out in the anatomy of a round brilliant, and the measured standard we compare against is T57, the stone Tolkowsky published in 1919.
Materials
In moissanite the baguette returns 32.22% for 55.92 Global, with fire at 74.90 against 62.11 in diamond. Moissanite is doubly refractive, and a step cut with fourteen large facets is the easiest place in all of jewellery to see that doubling, because nothing in the facet pattern disguises it.
In cubic zirconia it returns 45.89% for 59.37 Global. Zirconia in a baguette is a common combination in costume and fashion jewellery, and the soft, mirror-like flash is a large part of why it works there.
Compare all three for this shape in the Index.
Trade-offs
Questions
The questions buyers actually ask, answered in full. Where the answer is ours to prove, the figure is measured on the Index; where it is an established gemological fact, it is stated as one.
A baguette diamond is a small rectangular step cut with 14 facets and square uncut corners, used almost entirely as an accent stone. Its long parallel facets produce broad mirror-like flashes rather than fine sparkle.
A straight baguette is a true rectangle with parallel sides, and a row of them reads as a continuous band of mirrored light. A tapered baguette narrows toward one short end and is set with its wide end against the centre stone, so its flashes angle inward and frame the centre.
Because they carry 14 facets where a round brilliant carries 57. Our reference baguette measures 25 facets that actually reach the surface and scores 42.62 on scintillation, against 71.82 for the round-brilliant standard. Scintillation on our engine is a pure function of facet count, so this gap is arithmetic rather than a comment on cutting quality. A baguette is designed to flash, not to sparkle.
Fourteen. Only the triangular cut, at 19 measured facets, carries fewer among the shapes we publish.
They are the most fragile outline in this group. The corners are square, uncut and unprotected, which is precisely why channel settings and bezels became the standard way to mount them: both enclose the vulnerable edges rather than leaving them proud.
Higher than their size alone would suggest. With only fourteen large flat facets there is no scatter to hide an inclusion or a tint behind, so a baguette shows what is in it. In practice their small size limits how much is visible, but the principle should guide the parcel you buy from.
Rarely. Their normal role is as accents: side stones flanking a centre, channel settings, and eternity bands. Their rectangular outline sets flush against its neighbours with no gaps, which is the practical reason they dominate those designs.
Yes, considerably, per carat. They are usually sold as calibrated parcels matched to a millimetre size and a quality range rather than as individually certified stones, which lowers cost further.
Around 1.50 to 2.50, with roughly 2.00 the most common. Longer baguettes suit channels and bands; shorter ones suit clusters and geometric settings. Our reference baguette sits at 1.97.
They belong to the same step-cut family. An emerald cut adds cut corners and far more facets, typically 57 or 58 against a baguette’s 14, which gives it a much richer hall-of-mirrors effect. A baguette is the same idea reduced to its simplest form.
Next
See the whole set on the jewellery cuts index, or the measured house and historic cuts in the cut registry.
Method
Monte-Carlo on exact facet geometry: 3,200 rays face-up plus 2,200 at 20° tilt, cosine-weighted from a 7° near-vertical cone. Useful light is what exits through the crown within 64° of vertical. The same protocol runs on every cut on this site, so the figures are comparable to each other.
They measure our reference geometry for the shape at the proportions listed above, not an average of stones on the market. A baguette cut to different proportions will read differently. Treat them as a like-for-like comparison between shapes, not as a grade for any individual stone.
Engine estimates, ±2 points, not lab-certified grades. We do not publish the Index symmetry axis on these pages: it scores facet regularity within each pavilion family, which is meaningful for a round brilliant and misleading for a shape whose pavilion is deliberately irregular.
42.62 here against the standard’s 71.82. The term is 100(1−e−n/45) on the count of facets that actually reach the surface, so it is a pure function of facet count and nothing else.