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

As of October 2026, 3.00 to 4.99ct lab grown cushion diamonds range from £92 GBP/ct to £4,170 GBP/ct, with an average of £622 GBP/ct.

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

As of October 2026, the lowest listed price is £92 GBP per carat and the highest is £4,170 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 449,258 active lab grown cushion listings between 3.00 to 4.99ct across 100+ retailers in the Carat Hunter index, refreshed daily.

How much can I save by comparing retailers for a 3.00 to 4.99ct lab grown cushion diamond?

Approximately 42% of these diamonds are available at multiple retailers, with an average price spread of 95% between the cheapest and most expensive listing of the same stone.

Lab Grown Cushion Diamonds, 3.00 to 4.99ct

Quick answer

As of October 2026, there are 449,258 listings of lab grown cushion diamonds between 3.00 to 4.99ct from at least 63 retailers. A typical stone in this range costs about £2,364 GBP in total, or £622 GBP per carat, and most listings sit between £92 GBP and £4,170 GBP per carat. About 42% of these stones are listed by more than one retailer, and the same stone is priced 95% apart on average between its cheapest and most expensive seller. The best value grade combination with real depth of stock is F to G VS2 at £388 GBP per carat across 9,035 listings. The same shape in natural form runs about £9,161 GBP per carat, roughly 14.7 times more.

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

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Cushion lab grown stones in the index: 516 USD per carat, +6.9% month on month. See the full index release

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

Last updated: October 2026

Browse 449,258 diamonds in Explorer

Price Distribution

LowHigh

Colour	FL	IF	VVS1	VVS2	VS1	VS2	SI1	SI2
D-E	$2,135	$1,629	$983	$658	$573	$535	$397	$402
F-G	$1,858	$1,273	$780	$542	$522	$515	$412	$350
H-I	-	-	$1,411	$578	$557	$660	$515	$753
J-K	-	-	-	$471	$577	$735	$1,841	-
L-M	-	-	-	$631	$613	$524	-	-
N+	-	$2,289	$759	$589	$581	$525	$432	$410

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	19,861	£1,607 GBP	107%
D-E	IF	23,956	£1,226 GBP	88%
D-E	SI1	1,115	£299 GBP	114%
D-E	SI2	79	£303 GBP	227%
D-E	VS1	80,691	£431 GBP	97%
D-E	VS2	16,048	£403 GBP	93%
D-E	VVS1	47,628	£740 GBP	87%
D-E	VVS2	97,794	£495 GBP	95%
F-G	FL	126	£1,398 GBP	93%
F-G	IF	532	£958 GBP	79%
F-G	SI1	1,325	£310 GBP	104%
F-G	SI2	85	£263 GBP	119%
F-G	VS1	43,596	£393 GBP	92%
F-G	VS2	9,035	£388 GBP	92%
F-G	VVS1	4,951	£587 GBP	94%
F-G	VVS2	42,974	£408 GBP	98%
H-I	SI1	310	£388 GBP	160%
H-I	SI2	44	£567 GBP	111%
H-I	VS1	5,050	£419 GBP	99%
H-I	VS2	1,410	£497 GBP	94%
H-I	VVS1	224	£1,062 GBP	52%
H-I	VVS2	2,619	£435 GBP	105%
J-K	SI1	19	£1,385 GBP	98%
J-K	VS1	253	£434 GBP	85%
J-K	VS2	68	£553 GBP	123%
J-K	VVS2	191	£354 GBP	103%
L-M	VS1	300	£461 GBP	33%
L-M	VS2	12	£394 GBP	31%
L-M	VVS2	106	£475 GBP	29%
N+	IF	66	£1,722 GBP	49%
N+	SI1	1,253	£325 GBP	108%
N+	SI2	185	£309 GBP	105%
N+	VS1	24,073	£437 GBP	96%
N+	VS2	8,472	£395 GBP	101%
N+	VVS1	698	£571 GBP	89%
N+	VVS2	12,626	£443 GBP	93%
N+	other	1,483	£1,722 GBP	13%

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