Buy a 3-carat round diamond – Price & Size

3-carat round diamonds

At 3 carats, a round diamond measures approximately 9.3 mm in diameter and becomes the focal point of the ring. At this size, every detail is visible to the naked eye, so grades F through G and clarity grades VS1 through VS2 are recommended. Lab-grown diamonds are significantly more affordable than comparable natural diamonds, and the price difference is particularly noticeable at this size.

Stone	Form			Purity		Pol.	Sym.	Fluorine.	Laboratory	Dimensions	L/W	Table	Depth	Delivery Time
360°	Round	3,01	H	SI1	Excellent	EX	EX	Strong	GIA	9.17 × 9.12 × 5.75	1,01	58 %	62,9 %	4–6 wt.	27.380 €
360°	Round	3,49	I	SI1	Excellent	EX	EX	None	GIA	9.69 × 9.63 × 6.03	1,01	59 %	62,4 %	4–6 wt.	37.710 €
360°	Round	3,21	I	VS1	Excellent	EX	EX	None	GIA	9.45 × 9.39 × 5.89	1,01	59 %	62,6 %	4–6 wt.	41.240 €
360°	Round	3,00	G	SI1	Excellent	EX	EX	None	IGI	9.05 × 9.14 × 5.80	0,99	56 %	63,7 %	4–6 wt.	28.320 €
	Round	3,01	G	VVS2	Excellent	EX	EX	None	HRD	9.16 × 9.13 × 5.73	1,00	59 %	62,7 %	5–7 wt.	42.360 €
360°	Round	3,00	G	VS1	Excellent	EX	EX	Weak	GIA	9.18 × 9.24 × 5.65	0,99	60 %	61,3 %	10–12 weeks	54.420 €
360°	Round	3,02	F	SI1	Excellent	EX	EX	None	GIA	9.25 × 9.19 × 5.75	1,01	59 %	62,4 %	4–6 wt.	39.970 €
360°	Round	3,00	I	VS1	Excellent	EX	EX	None	IGI	9.12 × 9.19 × 5.74	0,99	56 %	62,6 %	7–9 wt.	25.450 €
360°	Round	3,01	H	VS2	Excellent	EX	EX	None	IGI	9.10 × 9.16 × 5.80	0,99	56 %	63,4 %	7–9 wt.	27.700 €
360°	Round	3,01	H	VS1	Excellent	EX	EX	None	IGI	9.24 × 9.27 × 5.76	1,00	57 %	62,3 %	7–9 wt.	30.670 €
360°	Round	3,30	I	VS1	Excellent	EX	EX	None	IGI	9.50 × 9.53 × 5.90	1,00	59 %	62,0 %	7–9 wt.	29.830 €
360°	Round	3,17	D	VVS2	Excellent	EX	EX	Very strong	GIA	9.44 × 9.39 × 5.82	1,01	59 %	61,9 %	7–9 wt.	52.730 €
360°	Round	3,23	D	VVS2	Excellent	EX	EX	Medium	GIA	9.47 × 9.43 × 5.82	1,00	59 %	61,6 %	7–9 wt.	63.170 €
360°	Round	3,00	I	VS1	Excellent	EX	VG	None	GIA	9.18 × 9.04 × 5.73	1,02	58 %	62,9 %	5–7 wt.	33.870 €
360°	Round	3,35	J	VVS2	Excellent	EX	EX	Weak	GIA	9.61 × 9.56 × 5.88	1,01	59 %	61,3 %	5–7 wt.	35.010 €
360°	Round	3,01	J	SI1	Excellent	EX	EX	None	GIA	9.12 × 9.19 × 5.76	0,99	57 %	63,0 %	7–9 wt.	25.190 €
360°	Round	3,01	J	VS1	Excellent	EX	EX	None	GIA	9.21 × 9.17 × 5.73	1,00	58 %	62,3 %	7–9 wt.	30.390 €
360°	Round	3,01	J	SI1	Excellent	EX	EX	None	GIA	9.36 × 9.29 × 5.62	1,01	60 %	60,3 %	7–9 wt.	23.580 €
360°	Round	3,98	J	VS1	Excellent	EX	EX	None	IGI	10.01 × 10.05 × 6.27	1,00	59 %	62,5 %	7–9 wt.	33.080 €
360°	Round	3,70	J	VS2	Excellent	EX	EX	Medium	GIA	9.78 × 9.85 × 6.20	0,99	55 %	0,0 %	4–6 wt.	35.020 €
360°	Round	3,01	J	VS1	Excellent	EX	EX	None	IGI	9.28 × 9.33 × 5.71	0,99	61 %	61,3 %	7–9 wt.	20.740 €
360°	Round	3,01	D	IF	Excellent	EX	EX	None	GIA	9.21 × 9.16 × 5.74	1,01	60 %	62,5 %	4–6 wt.	112.970 €
360°	Round	3,10	I	VVS2	Excellent	EX	EX	Weak	GIA	9.27 × 9.33 × 5.82	0,99	58 %	62,6 %	4–6 wt.	39.580 €
360°	Round	3,50	H	VS2	Excellent	EX	EX	Weak	GIA	9.65 × 9.71 × 6.04	0,99	59 %	62,4 %	4–6 wt.	53.120 €

360°

3.01 ct · Round

Color H · SI1

Ø 9.1 mm

27,380 €GIA

360°

3.49 ct · Round

Color I · SI1

Ø 9.7 mm

37,710 €GIA

360°

3.21 ct · Round

Color I · VS1

Ø 9.4 mm

41,240 €GIA

360°

3.00 ct · Round

Color G · SI1

Ø 9.1 mm

28,320 €IGI

3.01 ct · Round

Color G · VVS2

Ø 9.1 mm

42,360 €HRD

360°

3.00 ct · Round

Color G · VS1

Ø 9.2 mm

54,420 €GIA

360°

3.02 ct · Round

Colour F · SI1

Ø 9.2 mm

39,970 €GIA

360°

3.00 ct · Round

Color I · VS1

Ø 9.2 mm

25,450 €IGI

360°

3.01 ct · Round

Color H · VS2

Ø 9.1 mm

27,700 €IGI

360°

3.01 ct · Round

Color H · VS1

Ø 9.3 mm

€30,670IGI

360°

3.30 ct · Round

Color I · VS1

Ø 9.5 mm

29,830 €IGI

360°

3.17 ct · Round

Colour D · VVS2

Ø 9.4 mm

52,730 €GIA

360°

3.23 ct · Round

Colour D · VVS2

Ø 9.5 mm

63,170 €GIA

360°

3.00 ct · Round

Color I · VS1

Ø 9.1 mm

33,870 €GIA

360°

3.35 ct · Round

Color J · VVS2

Ø 9.6 mm

35,010 €GIA

360°

3.01 ct · Round

Color J · SI1

Ø 9.2 mm

25,190 €GIA

360°

3.01 ct · Round

Color J · VS1

Ø 9.2 mm

30,390 €GIA

360°

3.01 ct · Round

Color J · SI1

Ø 9.3 mm

23,580 €GIA

360°

3.98 ct · Round

Color J · VS1

Ø 10.0 mm

33,080 €IGI

360°

3.70 ct · Round

Color J · VS2

Ø 9.8 mm

35,020 €GIA

360°

3.01 ct · Round

Color J · VS1

Ø 9.3 mm

€20,740IGI

360°

3.01 ct · Round

Color D · IF

Ø 9.2 mm

112,970 €GIA

360°

3.10 ct · Round

Color I · VVS2

Ø 9.3 mm

39,580 €GIA

360°

3.50 ct · Round

Color H · VS2

Ø 9.7 mm

53,120 €GIA

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. 5.1 mm
1 ct	approx. 6.5 mm
1.5 ct	approx. 7.4 mm
2 ct	approx. 8.1 mm
3 ct	approx. 9.3 mm

Carat

Approx. size (mm)

0.5 ct

approx. 5.1 mm

1 ct

approx. 6.5 mm

1.5 ct

approx. 7.4 mm

2 ct

approx. 8.1 mm

3 ct

approx. 9.3 mm

What to Look for in Round Diamonds

Cut: Only here is there an overall grade

Round is the only shape for which the GIA and IGI assign a cut grade of “Excellent” or lower. This grade encompasses proportions, polish, and symmetry and is the single most important factor in a diamond’s brilliance. Look at this first, then at the rest. Two stones with the same carat weight, colour, and clarity can differ significantly based solely on their cut.

Colour and Purity: Where the Sweet Spot Lies

The round brilliant cut refracts light more strongly than any other cut, thereby concealing small inclusions. VS2 and, often, SI1 diamonds appear clear to the naked eye as long as the inclusions are not centreed beneath the table. As for colour, a grade of G to H is sufficient to create an impression that is virtually indistinguishable from colourless, especially in white gold or platinum.

Size: What One Carat Means in Millimeters

One carat equals 0.2 grams; it is therefore a unit of weight, not a unit of size. A round diamond weighing 1 ct measures approximately 6.5 mm in diameter, while a 2 ct diamond measures approximately 8.1 mm. Although the weight doubles, the visible diameter increases by only about a quarter. If you’re looking for visual size, you should also make sure the stone’s depth isn’t too great.

Frequently Asked Questions

How big is a 3-carat round diamond?

The diameter is approximately 9.3 mm. Compared to a carat, which is about 6.5 mm, this is about 40 percent wider, even though the weight is three times as much. The rest of the mass is contained within the depth of the stone and lies beneath the setting.

What should I pay special attention to with 3 carats?

Cut and clarity. A larger table reveals inclusions more clearly, so VS1 to VS2 is the safer choice. When it comes to cut, “Excellent” is worth the investment because it determines how the light behaves across the entire surface. The setting should be able to securely hold a stone of this weight.

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.