1-Carat Cushion-Cut Diamond – Price & Size

1-carat cushion-cut diamonds

A 1-carat cushion cut measures approximately 5.5 × 5.5 mm and, thanks to its soft corners, has a more subdued appearance than a princess cut. Because the fine faceting effectively conceals inclusions, SI1 diamonds are often eye-clean; for color, G to H is a solid compromise. Lab-grown diamonds are significantly less expensive than comparable natural diamonds.

Stone	Form			Purity		Pol.	Sym.	Fluorine.	Laboratory	Dimensions	L/W	Table	Depth	Delivery Time
360°	Pillow	1,44	F	VS1	–	EX	EX	None	IGI	8.30 × 5.58 × 3.61	1,49	64 %	64,7 %	4–6 wt.	1.770 €
360°	Pillow	1,29	E	VS1	–	EX	EX	None	IGI	7.54 × 5.31 × 3.49	1,42	71 %	65,7 %	7–9 wt.	1.020 €
360°	Pillow	1,00	F	VS1	–	EX	EX	None	IGI	5.86 × 5.66 × 3.87	1,04	66 %	68,4 %	7–9 wt.	940 €
360°	Pillow	1,03	E	VVS2	–	EX	EX	None	IGI	5.86 × 5.82 × 3.96	1,01	61 %	68,0 %	4–6 wt.	1.070 €
360°	Pillow	1,02	F	VVS2	–	EX	EX	None	IGI	5.80 × 5.76 × 3.90	1,01	62 %	67,7 %	4–6 wt.	1.060 €
360°	Pillow	1,39	D	VS1	–	EX	EX	None	IGI	6.60 × 6.51 × 4.33	1,01	61 %	66,5 %	4–6 wt.	1.380 €
360°	Pillow	1,49	D	VS1	–	EX	EX	None	IGI	8.11 × 5.83 × 3.97	1,39	61 %	68,1 %	4–6 wt.	1.420 €
360°	Pillow	1,38	E	VVS2	–	EX	EX	None	IGI	7.80 × 5.75 × 3.90	1,36	61 %	67,8 %	4–6 wt.	1.340 €
360°	Pillow	1,03	D	VVS2	–	EX	VG	None	IGI	6.97 × 4.72 × 3.33	1,48	58 %	70,6 %	4–6 wt.	1.780 €
360°	Pillow	1,03	E	VS2	–	VG	VG	None	IGI	7.16 × 5.18 × 3.41	1,38	60 %	65,8 %	4–6 wt.	2.200 €
360°	Pillow	1,05	D	VVS2	–	EX	EX	None	IGI	7.35 × 5.28 × 3.64	1,39	62 %	68,9 %	7–9 wt.	880 €
360°	Pillow	1,02	D	VVS2	–	EX	EX	None	IGI	7.18 × 5.28 × 3.57	1,36	62 %	67,6 %	7–9 wt.	860 €
360°	Pillow	1,07	D	VVS2	–	EX	EX	None	IGI	7.11 × 5.40 × 3.71	1,32	63 %	68,7 %	7–9 wt.	890 €
360°	Pillow	1,07	D	VVS2	–	EX	EX	None	IGI	7.22 × 5.38 × 3.68	1,34	61 %	68,4 %	7–9 wt.	890 €
360°	Pillow	1,07	D	VVS2	–	EX	EX	None	IGI	7.38 × 5.45 × 3.69	1,35	59 %	67,7 %	7–9 wt.	890 €
360°	Pillow	1,04	D	VS1	–	EX	EX	None	IGI	6.52 × 5.19 × 3.66	1,26	65 %	70,5 %	7–9 wt.	890 €
360°	Pillow	1,44	D	VS1	–	EX	EX	None	IGI	7.81 × 6.12 × 4.14	1,28	59 %	67,6 %	4–6 wt.	2.080 €
360°	Pillow	1,06	E	VVS2	–	EX	EX	None	IGI	6.03 × 5.89 × 3.88	1,02	62 %	65,9 %	7–9 wt.	930 €
360°	Pillow	1,02	D	VS2	–	EX	EX	None	IGI	6.26 × 5.44 × 3.67	1,15	64 %	67,5 %	7–9 wt.	820 €
360°	Pillow	1,03	E	VVS2	–	EX	EX	None	IGI	6.38 × 5.45 × 3.74	1,17	63 %	68,6 %	7–9 wt.	890 €
360°	Pillow	1,38	D	VS1	–	EX	EX	None	IGI	6.70 × 6.27 × 4.27	1,07	63 %	68,1 %	7–9 wt.	1.020 €
360°	Pillow	1,02	D	VVS2	–	EX	EX	None	IGI	6.98 × 5.18 × 3.38	1,35	59 %	65,3 %	4–6 wt.	1.090 €
360°	Pillow	1,05	F	VVS1	–	EX	EX	None	IGI	6.02 × 5.89 × 3.90	1,02	60 %	66,2 %	4–6 wt.	1.140 €
360°	Pillow	1,21	D	VVS1	–	EX	EX	None	IGI	7.69 × 5.35 × 3.64	1,44	58 %	68,0 %	4–6 wt.	1.270 €

360°

1.44 ct · Cushion

Colour F · VS1

8.3 × 5.6 mm

1,770 €IGI

360°

1.29 ct · Cushion

Colour E · VS1

7.5 × 5.3 mm

1,020 €IGI

360°

1.00 ct · Cushion

Colour F · VS1

5.9 × 5.7 mm

940 €IGI

360°

1.03 ct · Cushion

Colour E · VVS2

5.9 × 5.8 mm

1,070 €IGI

360°

1.02 ct · Cushion

Colour F · VVS2

5.8 × 5.8 mm

1,060 €IGI

360°

1.39 ct · Cushion

Colour D · VS1

6.6 × 6.5 mm

1,380 €IGI

360°

1.49 ct · Cushion

Colour D · VS1

8.1 × 5.8 mm

1,420 €IGI

360°

1.38 ct · Cushion

Colour E · VVS2

7.8 × 5.8 mm

1,340 €IGI

360°

1.03 ct · Cushion

Colour D · VVS2

7.0 × 4.7 mm

1,780 €IGI

360°

1.03 ct · Cushion

Colour E · VS2

7.2 × 5.2 mm

2,200 €IGI

360°

1.05 ct · Cushion

Colour D · VVS2

7.4 × 5.3 mm

880 €IGI

360°

1.02 ct · Cushion

Colour D · VVS2

7.2 × 5.3 mm

860 €IGI

360°

1.07 ct · Cushion

Colour D · VVS2

7.1 × 5.4 mm

890 €IGI

360°

1.07 ct · Cushion

Colour D · VVS2

7.2 × 5.4 mm

890 €IGI

360°

1.07 ct · Cushion

Colour D · VVS2

7.4 × 5.5 mm

890 €IGI

360°

1.04 ct · Cushion

Colour D · VS1

6.5 × 5.2 mm

890 €IGI

360°

1.44 ct · Cushion

Colour D · VS1

7.8 × 6.1 mm

2,080 €IGI

360°

1.06 ct · Cushion

Colour E · VVS2

6.0 × 5.9 mm

930 €IGI

360°

1.02 ct · Cushion

Colour D · VS2

6.3 × 5.4 mm

820 €IGI

360°

1.03 ct · Cushion

Colour E · VVS2

6.4 × 5.5 mm

890 €IGI

360°

1.38 ct · Cushion

Colour D · VS1

6.7 × 6.3 mm

1,020 €IGI

360°

1.02 ct · Cushion

Colour D · VVS2

7.0 × 5.2 mm

1,090 €IGI

360°

1.05 ct · Cushion

Colour F · VVS1

6.0 × 5.9 mm

1,140 €IGI

360°

1.21 ct · Cushion

Colour D · VVS1

7.7 × 5.4 mm

1,270 €IGI

All prices include 19% VAT · 14-day right of withdrawal · Stones are sold individually and may be sold out on short notice.

Carat	Approx. size (mm)
0.5 ct	approx. 4.4 × 4.4 mm
1 ct	approx. 5.5 × 5.5 mm
1.5 ct	approx. 6.3 × 6.3 mm
2 ct	approx. 7.0 × 7.0 mm
3 ct	approx. 8.0 × 8.0 mm

Carat

Approx. size (mm)

0.5 ct

approx. 4.4 × 4.4 mm

1 ct

approx. 5.5 × 5.5 mm

1.5 ct

approx. 6.3 × 6.3 mm

2 ct

approx. 7.0 × 7.0 mm

3 ct

approx. 8.0 × 8.0 mm

What to Look for in Cushion-Cut Diamonds

Check the faceted view and proportions

There is no single standard for the overall cut quality of cushion-cut diamonds. Pay attention to polish and symmetry, as well as table and depth. The facet pattern is also important: Coarse, angular facets produce large flashes of light, while the finer “crushed ice” pattern appears more granular and sparkly. Both are correctly cut, but the effect differs significantly, so it’s worth taking a look at a photo or video.

Color and Clarity in the Cushion Cut

The cushion cut retains body color slightly better than a round stone, which is why grades G through H are a good compromise, and grades F through G look more subdued at two carats and above. It is forgiving when it comes to clarity: the finely detailed faceting effectively conceals inclusions, and SI1 is often eye-clean, especially in “crushed ice” stones.

Size in millimeters per carat

A square cushion cut diamond weighing 1 ct measures approximately 5.5 × 5.5 mm; a 1.5 ct diamond measures approximately 6.3 × 6.3 mm; and a 2 ct diamond measures approximately 7.0 × 7.0 mm. The cushion cut has a relatively large amount of weight concentrated in its depth, so it appears slightly smaller from above than an oval of the same weight.

Frequently Asked Questions

How big does a 1-carat cushion-cut diamond appear?

The edge length is approximately 5.5 mm; the diagonal is longer than that. Viewed from above, the cushion cut appears to have a smaller surface area than an oval of the same weight because it has a comparatively large amount of mass in the depth. A shallower depth increases the visible outline.

Is SI1 good enough for a 1-carat cushion-cut diamond?

Often, yes. The finely faceted surface refracts light in such a way that small inclusions disappear—even more so in crushed-ice-cut stones. For coarsely faceted stones, VS2 is the safe choice. The key factor remains the location of the inclusions in the certificate diagram.

Lab-grown diamond or natural diamond?

Lab-grown diamonds and natural diamonds are both composed of pure carbon and share the same crystal structure, hardness, and refractive index. The difference lies in their formation: one forms over millions of years in the Earth’s crust, while the other is created in a matter of weeks in a laboratory. Visually, they are indistinguishable without specialized laboratory equipment. Lab-grown diamonds are significantly less expensive than comparable natural diamonds, which is why you can often get more carats or a higher clarity grade for the same budget. Both types are certified by IGI or GIA; you can look up the report number directly with the lab.