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

As of October 2026, 3.00 to 4.99ct D FL lab grown cushion diamonds typically cost £1,878 GBP to £13,302 GBP, with a median price of £4,312 GBP. There are currently 1,453 diamonds matching this specification available across retailers.

Where can I find the best price on a D FL cushion diamond?

About 47% of these diamonds are available at multiple retailers, with an average price spread of 103%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct D FL Lab Grown Cushion

Quick answer

As of October 2026, there are 1,453 lab grown cushion diamonds with D colour and FL clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £1,878 GBP to £13,302 GBP, with a median of £4,312 GBP. At least 39 retailers stock this exact specification, and 47% of the stones appear at more than one of them, with an average price spread of 103%. Half of all listings fall between £842 GBP and £2,295 GBP per carat. The same specification in natural form lists at a median of about £21,138 GBP per carat. Over the last 30 days the median price moved -16.8% and the number of listings moved +20.1%.

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

Available

1,453

Lowest Price

£1,428 GBP

Highest Price

£39,105 GBP

Average Price

£6,177 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

47.0%

Price Spread

103.4%

30-Day Price Trend

-16.8%

30-Day Supply Change

+20.1%

Volatility (30d)

0.05

Price Range

Price per carat distribution across retailers

$1,866/ct

10th Percentile

$839

Median

$1,866

90th Percentile

$4,254

Score Distribution

4.5K diamonds scored across 5 quality tiers

Exceptional

136 (3.0%)

Excellent

1,734 (38.1%)

Very Good

559 (12.3%)

Good

1,732 (38.1%)

Average

388 (8.5%)

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Related Specifications

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