Size guides › Marquise
Marquise diamonds
Marquise diamond size chart
Long and pointed at both ends, with the most face-up size for the weight. A marquise (say mar-KEEZ) is a long, boat-shaped brilliant with a point at each end. Of all nine shapes here, it covers the most finger for its weight.
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Every marquise size, drawn to scale
From 0.25 to 3 carats, on a millimeter grid. Tap a size to jump to it.
| Carat | Size (mm) | Looks like a round of | Covers of a size 6 finger |
|---|---|---|---|
| 0.25 ct | 6.15 × 3.24 mm | 0.28 ct | 18% |
| 0.5 ct | 7.75 × 4.08 mm | 0.56 ct | 23% |
| 0.75 ct | 8.87 × 4.67 mm | 0.85 ct | 26% |
| 1 ct | 9.77 × 5.14 mm | 1.13 ct | 29% |
| 1.25 ct | 10.52 × 5.54 mm | 1.41 ct | 31% |
| 1.5 ct | 11.18 × 5.88 mm | 1.69 ct | 33% |
| 2 ct | 12.30 × 6.48 mm | 2.26 ct | 37% |
| 2.5 ct | 13.25 × 6.98 mm | 2.82 ct | 39% |
| 3 ct | 14.08 × 7.41 mm | 3.38 ct | 42% |
Typical proportions. Real stones vary by a few tenths of a millimeter — the certificate gives the exact size.
What to know about marquise diamonds
Two points to protect
Both tips are delicate, so a marquise is usually held with a V-prong over each end.
Watch for the bow-tie
Elongated brilliants can show a dark band across the middle. A faint one is normal; a strong one dulls the stone.
Classic ratios
Most marquises run from about 1.75 to 2.25 long-to-wide. The longer the stone, the more dramatic it looks along the finger.
Length-to-width ratio
Two marquises of the same weight can look quite different. These three all weigh 1 ct; only the ratio changes — from 9.3 mm long at 1.75 : 1 to 10.3 mm at 2.10 : 1. It's a matter of taste, not quality.
Marquise vs round
The dashed line is a 1 ct round. A 1 ct marquise covers about 8% more area from above.
Size by size
Every marquise weight, answered
0.25 carat marquise
How big is a 0.25 carat marquise diamond?
About 6.2 × 3.2 mm, and it looks about as big as a 0.28 ct round. Laid on a US dime (17.91 mm), it would cover about a third of the coin's width lengthwise and a fifth of it across.
Small and delicate
A quarter carat reads as a bright point of sparkle rather than a statement. It's a lovely size for minimalist and stacking rings and for anyone who wants something that sits close and never catches, and it leaves room in the budget for a better cut or color. As a marquise, it looks about 8% bigger from above than a round of the same weight, so it delivers more of this size's presence for the money.
Want it to look bigger?
A halo of small diamonds around it takes the face-up width from 3.24 mm to about 4.5 mm — 38% wider — for much less than a bigger center stone would cost.
The same size in other shapes
To cover the same area from above you'd need about 0.28 ct in a round, 0.25 ct in an oval and 0.33 ct in a cushion.
Settings
- Made to orderSolitaire, halo, three stone, bezel, cathedral and east–west — the ready-made heads we could find are for round and oval stones, so ask for one made at 6.2×3.2 mm.
Shop a 0.25 ct marquise: Blue Nile · Blue Nile, lab-grown · With Clarity · Rare Carat
Blue Nile opens already narrowed to 0.23–0.27 ct at a length-to-width ratio of 1.85 to 1.95 — the range of weights a stone this size can be — so the first page of results is this size rather than every marquise they carry. It also asks for a well-cut marquise's depth (57–67%) and table (52–62%).
0.5 carat marquise
How big is a 0.5 carat marquise diamond?
About 7.8 × 4.1 mm, and it looks about as big as a 0.56 ct round. Laid on a US dime (17.91 mm), it would cover about two-fifths of the coin's width lengthwise and a quarter of it across.
Petite and practical
Half a carat is a classic petite size: noticeable without being showy, comfortable for everyday wear, and easy to set low so it doesn't snag on gloves or knitwear. As a marquise, it looks about 8% bigger from above than a round of the same weight, so it delivers more of this size's presence for the money.
Consider 0.45 ct
Prices tend to step up at round weights like 0.5 ct. A 0.45 ct marquise measures about 7.48 × 3.94 mm — only 0.14 mm narrower, with 7% less area on top. That's very hard to see on a hand.
Want it to look bigger?
A halo of small diamonds around it takes the face-up width from 4.08 mm to about 5.6 mm — 38% wider — for much less than a bigger center stone would cost.
The same size in other shapes
To cover the same area from above you'd need about 0.56 ct in a round, 0.50 ct in an oval and 0.67 ct in a cushion.
Settings
- Made to orderSolitaire, halo, three stone, bezel, cathedral and east–west — the ready-made heads we could find are for round and oval stones, so ask for one made at 7.8×4.1 mm.
Shop a 0.5 ct marquise: Blue Nile · Blue Nile, lab-grown · With Clarity · Rare Carat
Blue Nile opens already narrowed to 0.47–0.54 ct at a length-to-width ratio of 1.85 to 1.95 — the range of weights a stone this size can be — so the first page of results is this size rather than every marquise they carry. It also asks for a well-cut marquise's depth (57–67%) and table (52–62%).
0.75 carat marquise
How big is a 0.75 carat marquise diamond?
About 8.9 × 4.7 mm, and it looks about as big as a 0.85 ct round. Laid on a US dime (17.91 mm), it would cover about half of the coin's width lengthwise and a quarter of it across.
Just under the milestone
Three-quarters of a carat gives a good share of the look of a one-carat stone, and on a slim finger the difference can be hard to see. It's a sensible size if the budget is better spent on cut quality or the setting. As a marquise, it looks about 8% bigger from above than a round of the same weight, so it delivers more of this size's presence for the money.
Want it to look bigger?
A halo of small diamonds around it takes the face-up width from 4.67 mm to about 6.4 mm — 38% wider — for much less than a bigger center stone would cost.
The same size in other shapes
To cover the same area from above you'd need about 0.85 ct in a round, 0.75 ct in an oval and 1.00 ct in a cushion.
Settings
- Made to orderSolitaire, halo, three stone, bezel, cathedral and east–west — the ready-made heads we could find are for round and oval stones, so ask for one made at 8.9×4.7 mm.
Shop a 0.75 ct marquise: Blue Nile · Blue Nile, lab-grown · With Clarity · Rare Carat
Blue Nile opens already narrowed to 0.70–0.80 ct at a length-to-width ratio of 1.85 to 1.95 — the range of weights a stone this size can be — so the first page of results is this size rather than every marquise they carry. It also asks for a well-cut marquise's depth (57–67%) and table (52–62%).
1 carat marquise
How big is a 1 carat marquise diamond?
About 9.8 × 5.1 mm, and it looks about as big as a 1.13 ct round. Laid on a US dime (17.91 mm), it would cover about half of the coin's width lengthwise and a quarter of it across.
The milestone size
One carat is the size many people picture when they think of an engagement ring. It's clearly a center stone without being heavy, and it suits almost every setting style. As a marquise, it looks about 8% bigger from above than a round of the same weight, so it delivers more of this size's presence for the money.
Consider 0.9 ct
Prices tend to step up at round weights like 1 ct. A 0.9 ct marquise measures about 9.43 × 4.96 mm — only 0.18 mm narrower, with 7% less area on top. That's very hard to see on a hand.
Turned east–west
Set across the finger instead of along it, its 9.77 mm length spans 55% of a size 6 finger instead of 29%. A modern look that reads wider.
The same size in other shapes
To cover the same area from above you'd need about 1.13 ct in a round, 1.00 ct in an oval and 1.34 ct in a cushion.
Settings
- Made to orderSolitaire, halo, three stone, bezel, cathedral and east–west — the ready-made heads we could find are for round and oval stones, so ask for one made at 9.8×5.1 mm.
Shop a 1 ct marquise: Blue Nile · Blue Nile, lab-grown · With Clarity · Rare Carat
Blue Nile opens already narrowed to 0.93–1.07 ct at a length-to-width ratio of 1.85 to 1.95 — the range of weights a stone this size can be — so the first page of results is this size rather than every marquise they carry. It also asks for a well-cut marquise's depth (57–67%) and table (52–62%).
1.25 carat marquise
How big is a 1.25 carat marquise diamond?
About 10.5 × 5.5 mm, and it looks about as big as a 1.41 ct round. Laid on a US dime (17.91 mm), it would cover about three-fifths of the coin's width lengthwise and a third of it across.
A step past one carat
A quarter carat over the milestone. It reads as noticeably substantial on most hands while still sitting comfortably in standard settings, and it avoids the round-number weights where prices tend to jump. As a marquise, it looks about 8% bigger from above than a round of the same weight, so it delivers more of this size's presence for the money.
Turned east–west
Set across the finger instead of along it, its 10.52 mm length spans 60% of a size 6 finger instead of 31%. A modern look that reads wider.
The same size in other shapes
To cover the same area from above you'd need about 1.41 ct in a round, 1.26 ct in an oval and 1.67 ct in a cushion.
Settings
- Made to orderSolitaire, halo, three stone, bezel, cathedral and east–west — the ready-made heads we could find are for round and oval stones, so ask for one made at 10.5×5.5 mm.
Shop a 1.25 ct marquise: Blue Nile · Blue Nile, lab-grown · With Clarity · Rare Carat
Blue Nile opens already narrowed to 1.16–1.34 ct at a length-to-width ratio of 1.85 to 1.95 — the range of weights a stone this size can be — so the first page of results is this size rather than every marquise they carry. It also asks for a well-cut marquise's depth (57–67%) and table (52–62%).
1.5 carat marquise
How big is a 1.5 carat marquise diamond?
About 11.2 × 5.9 mm, and it looks about as big as a 1.69 ct round. Laid on a US dime (17.91 mm), it would cover about three-fifths of the coin's width lengthwise and a third of it across.
A clear statement
At a carat and a half, the stone is the first thing people notice about the ring. It's still easy to wear every day, but cut quality starts to show more, because there's more stone to see. As a marquise, it looks about 8% bigger from above than a round of the same weight, so it delivers more of this size's presence for the money.
Consider 1.4 ct
Prices tend to step up at round weights like 1.5 ct. A 1.4 ct marquise measures about 10.92 × 5.75 mm — only 0.13 mm narrower, with 4% less area on top. That's very hard to see on a hand.
Turned east–west
Set across the finger instead of along it, its 11.18 mm length spans 63% of a size 6 finger instead of 33%. That's a lot of finger; try it on a photo of your own hand first.
Long on the finger
At 11.2 mm from tip to tip, a 1.5 ct marquise runs well along the finger. Both points need V-prongs to protect them.
The same size in other shapes
To cover the same area from above you'd need about 1.69 ct in a round, 1.51 ct in an oval and 2.01 ct in a cushion.
Settings
- Made to orderSolitaire, halo, three stone, bezel, cathedral and east–west — the ready-made heads we could find are for round and oval stones, so ask for one made at 11.2×5.9 mm.
Shop a 1.5 ct marquise: Blue Nile · Blue Nile, lab-grown · With Clarity · Rare Carat
Blue Nile opens already narrowed to 1.39–1.60 ct at a length-to-width ratio of 1.85 to 1.95 — the range of weights a stone this size can be — so the first page of results is this size rather than every marquise they carry. It also asks for a well-cut marquise's depth (57–67%) and table (52–62%).
2 carat marquise
How big is a 2 carat marquise diamond?
About 12.3 × 6.5 mm, and it looks about as big as a 2.26 ct round. Laid on a US dime (17.91 mm), it would cover about two-thirds of the coin's width lengthwise and a third of it across.
A large stone
Two carats is big on most hands and is seen from across a room. At this size clarity and color are easier to judge by eye, and a secure head matters more, so ask how it's set. As a marquise, it looks about 8% bigger from above than a round of the same weight, so it delivers more of this size's presence for the money.
Consider 1.9 ct
Prices tend to step up at round weights like 2 ct. A 1.9 ct marquise measures about 12.10 × 6.37 mm — only 0.11 mm narrower, with 3% less area on top. That's very hard to see on a hand.
Turned east–west
Set across the finger instead of along it, its 12.30 mm length spans 70% of a size 6 finger instead of 37%. That's a lot of finger; try it on a photo of your own hand first.
Long on the finger
At 12.3 mm from tip to tip, a 2 ct marquise runs well along the finger. Both points need V-prongs to protect them.
The same size in other shapes
To cover the same area from above you'd need about 2.26 ct in a round, 2.01 ct in an oval and 2.67 ct in a cushion.
Settings
- Made to orderSolitaire, halo, three stone, bezel, cathedral and east–west — the ready-made heads we could find are for round and oval stones, so ask for one made at 12.3×6.5 mm.
Shop a 2 ct marquise: Blue Nile · Blue Nile, lab-grown · With Clarity · Rare Carat
Blue Nile opens already narrowed to 1.86–2.14 ct at a length-to-width ratio of 1.85 to 1.95 — the range of weights a stone this size can be — so the first page of results is this size rather than every marquise they carry. It also asks for a well-cut marquise's depth (57–67%) and table (52–62%).
2.5 carat marquise
How big is a 2.5 carat marquise diamond?
About 13.3 × 7.0 mm, and it looks about as big as a 2.82 ct round. Laid on a US dime (17.91 mm), it would cover about three-quarters of the coin's width lengthwise and two-fifths of it across.
Very large
Two and a half carats is a very large stone for everyday wear. Setting height starts to matter: a lower head snags less, and a sturdy one protects a stone this valuable. Many owners have it appraised for insurance. As a marquise, it looks about 8% bigger from above than a round of the same weight, so it delivers more of this size's presence for the money.
Turned east–west
Set across the finger instead of along it, its 13.25 mm length spans 75% of a size 6 finger instead of 39%. That's a lot of finger; try it on a photo of your own hand first.
Long on the finger
At 13.3 mm from tip to tip, a 2.5 ct marquise runs well along the finger. Both points need V-prongs to protect them.
The same size in other shapes
To cover the same area from above you'd need about 2.82 ct in a round, 2.51 ct in an oval and 3.34 ct in a cushion.
Settings
- Made to orderSolitaire, halo, three stone, bezel, cathedral and east–west — the ready-made heads we could find are for round and oval stones, so ask for one made at 13.3×7 mm.
Shop a 2.5 ct marquise: Blue Nile · Blue Nile, lab-grown · With Clarity · Rare Carat
Blue Nile opens already narrowed to 2.33–2.68 ct at a length-to-width ratio of 1.85 to 1.95 — the range of weights a stone this size can be — so the first page of results is this size rather than every marquise they carry. It also asks for a well-cut marquise's depth (57–67%) and table (52–62%).
3 carat marquise
How big is a 3 carat marquise diamond?
About 14.1 × 7.4 mm, and it looks about as big as a 3.38 ct round. Laid on a US dime (17.91 mm), it would cover about four-fifths of the coin's width lengthwise and two-fifths of it across.
Dramatic
Three carats is a show-stopping size. It dominates all but the broadest fingers, so seeing it on your own hand before buying matters more here than at any other size. Look for a head made for a stone this size, and insure it. As a marquise, it looks about 8% bigger from above than a round of the same weight, so it delivers more of this size's presence for the money.
Consider 2.9 ct
Prices tend to step up at round weights like 3 ct. A 2.9 ct marquise measures about 13.93 × 7.33 mm — only 0.08 mm narrower, with 2% less area on top. That's very hard to see on a hand.
Turned east–west
Set across the finger instead of along it, its 14.08 mm length spans 80% of a size 6 finger instead of 42%. That's a lot of finger; try it on a photo of your own hand first.
Long on the finger
At 14.1 mm from tip to tip, a 3 ct marquise runs well along the finger. Both points need V-prongs to protect them.
The same size in other shapes
To cover the same area from above you'd need about 3.38 ct in a round, 3.01 ct in an oval and 4.01 ct in a cushion.
Settings
- Made to orderSolitaire, halo, three stone, bezel, cathedral and east–west — the ready-made heads we could find are for round and oval stones, so ask for one made at 14.1×7.4 mm.
Shop a 3 ct marquise: Blue Nile · Blue Nile, lab-grown · With Clarity · Rare Carat
Blue Nile opens already narrowed to 2.79–3.21 ct at a length-to-width ratio of 1.85 to 1.95 — the range of weights a stone this size can be — so the first page of results is this size rather than every marquise they carry. It also asks for a well-cut marquise's depth (57–67%) and table (52–62%).
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Questions
How big is a 0.25 carat marquise diamond?
About 6.15 × 3.24 mm, and it looks about as big as a 0.28 carat round.
How big is a 0.5 carat marquise diamond?
About 7.75 × 4.08 mm, and it looks about as big as a 0.56 carat round.
How big is a 0.75 carat marquise diamond?
About 8.87 × 4.67 mm, and it looks about as big as a 0.85 carat round.
How big is a 1 carat marquise diamond?
About 9.77 × 5.14 mm, and it looks about as big as a 1.13 carat round.
How big is a 1.25 carat marquise diamond?
About 10.52 × 5.54 mm, and it looks about as big as a 1.41 carat round.
How big is a 1.5 carat marquise diamond?
About 11.18 × 5.88 mm, and it looks about as big as a 1.69 carat round.
How big is a 2 carat marquise diamond?
About 12.30 × 6.48 mm, and it looks about as big as a 2.26 carat round.
How big is a 2.5 carat marquise diamond?
About 13.25 × 6.98 mm, and it looks about as big as a 2.82 carat round.
How big is a 3 carat marquise diamond?
About 14.08 × 7.41 mm, and it looks about as big as a 3.38 carat round.
Do marquise diamonds look bigger than round ones?
Yes. At the same weight a marquise covers about 8% more area from above than a round.
What is the best length-to-width ratio for a marquise?
There's no best — it's taste. Most marquises run from about 1.75 to 2.25 long-to-wide. The longer the stone, the more dramatic it looks along the finger.
What size setting does a marquise diamond need?
Any common style can be made to fit it: ask for a head the size of the stone — about 9.8×5.1 mm for a 1 ct. Ready-made heads are mostly listed for round stones, so for a marquise choose a setting made to order.