How much does a 3.00 to 4.99ct lab grown cushion diamond cost?

As of September 2026, 3.00 to 4.99ct lab grown cushion diamonds range from £124 GBP/ct to £10,658 GBP/ct, with an average of £896 GBP/ct.

What is the price range for 3.00 to 4.99ct lab grown cushion diamonds?

As of September 2026, the lowest listed price is £124 GBP per carat and the highest is £10,658 GBP per carat. The spread reflects differences in colour, clarity, cut and retailer pricing.

How many 3.00 to 4.99ct lab grown cushion diamonds are available?

There are 346,942 active lab grown cushion listings between 3.00 to 4.99ct across 100+ retailers in the Carat Hunter index, refreshed daily.

Lab Grown Cushion Diamonds, 3.00 to 4.99ct

Quick answer

As of September 2026, there are 346,942 lab grown cushion diamonds between 3.00 to 4.99ct listed by at least 54 retailers. A typical stone in this range costs about £3,405 GBP in total, or £896 GBP per carat, and most listings sit between £124 GBP and £10,658 GBP per carat. The best value grade combination with real depth of stock is F to G VS1 at £315 GBP per carat across 34,267 listings. The same shape in natural form runs about £9,992 GBP per carat, roughly 11.2 times more.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Cushion lab grown stones in the index: 466 USD per carat, -14.7% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Browse 346,942 diamonds in Explorer

Price Distribution

LowHigh

Colour	FL	IF	VVS1	VVS2	VS1	VS2	SI1	SI2	I
D-E	$3,125	$1,853	$900	$539	$461	$435	$377	$712	-
F-G	$2,082	$1,261	$709	$428	$400	$447	$378	$593	-
H-I	-	-	$1,458	$440	$481	$741	$625	$846	-
J-K	-	-	-	$408	$576	$1,297	$1,955	$5,425	$6,164
L-M	-	-	-	$534	$541	-	-	-	-
N+	-	$2,308	$673	$551	$519	$472	$385	$416	-

Price by Colour & Clarity

Average price per carat for 3.00 to 4.99ct lab grown cushion diamonds by colour and clarity grade.

Colour	Clarity	Listings	Avg Price/ct	Spread
D-E	FL	15,792	£2,461 GBP	107%
D-E	IF	15,252	£1,459 GBP	117%
D-E	SI1	878	£297 GBP	172%
D-E	SI2	79	£561 GBP	113%
D-E	VS1	65,125	£363 GBP	107%
D-E	VS2	11,933	£343 GBP	131%
D-E	VVS1	35,752	£709 GBP	133%
D-E	VVS2	86,870	£424 GBP	111%
F-G	FL	113	£1,639 GBP	100%
F-G	IF	375	£993 GBP	108%
F-G	SI1	979	£297 GBP	152%
F-G	SI2	78	£467 GBP	171%
F-G	VS1	34,267	£315 GBP	114%
F-G	VS2	7,076	£352 GBP	148%
F-G	VVS1	3,915	£558 GBP	134%
F-G	VVS2	34,838	£337 GBP	120%
H-I	SI1	263	£492 GBP	190%
H-I	SI2	38	£666 GBP	111%
H-I	VS1	3,789	£379 GBP	143%
H-I	VS2	1,231	£583 GBP	101%
H-I	VVS1	191	£1,148 GBP	30%
H-I	VVS2	2,019	£346 GBP	155%
J-K	I	24	£4,854 GBP	4%
J-K	SI1	87	£1,539 GBP	7%
J-K	SI2	20	£4,272 GBP	80%
J-K	VS1	215	£454 GBP	85%
J-K	VS2	97	£1,021 GBP	101%
J-K	VVS2	124	£321 GBP	104%
L-M	VS1	69	£426 GBP	20%
L-M	VVS2	35	£420 GBP	23%
N+	IF	47	£1,818 GBP	18%
N+	SI1	683	£303 GBP	94%
N+	SI2	118	£328 GBP	72%
N+	VS1	11,995	£409 GBP	93%
N+	VS2	4,149	£372 GBP	90%
N+	VVS1	348	£530 GBP	99%
N+	VVS2	6,337	£434 GBP	94%
N+	other	1,741	£1,789 GBP	12%

Explore by Specification

D FL D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 D SI2 E FL E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 E SI2 F FL F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 F SI2 G FL G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 G SI2 H FL H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 H SI2 I FL I IF I VVS1 I VVS2 I VS1 I VS2 I SI1 I SI2 J FL J IF J VVS1 J VVS2 J VS1 J VS2 J SI1 J SI2