How much does a 3.00 to 4.99ct F SI2 lab grown heart diamond cost?

As of October 2026, 3.00 to 4.99ct F SI2 lab grown heart diamonds typically cost £360 GBP to £1,373 GBP, with a median price of £795 GBP. There are currently 3 diamonds matching this specification available across retailers.

Where can I find the best price on a F SI2 heart diamond?

About 17% of these diamonds are available at multiple retailers, with an average price spread of 93%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct F SI2 Lab Grown Heart

Quick answer

As of October 2026, there are 3 lab grown heart diamonds with F colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £360 GBP to £1,373 GBP, with a median of £795 GBP. At least 17 retailers stock this exact specification, and 17% of the stones appear at more than one of them, with an average price spread of 93%. Half of all listings fall between £153 GBP and £343 GBP per carat. The same specification in natural form lists at a median of about £4,884 GBP per carat. Over the last 30 days the median price moved +15.8% and the number of listings moved +13.0%.

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. Heart lab grown stones in the index: 421 USD per carat, -1.8% 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

Lowest Price

£257 GBP

Highest Price

£2,649 GBP

Average Price

£813 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

16.7%

Price Spread

93.2%

30-Day Price Trend

+15.8%

30-Day Supply Change

+13.0%

Volatility (30d)

0.06

Price Range

Price per carat distribution across retailers

$273/ct

10th Percentile

$135

Median

$273

90th Percentile

$657

Score Distribution

7 diamonds scored across 3 quality tiers

Excellent

1 (14.3%)

Very Good

2 (28.6%)

Average

4 (57.1%)

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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