How much does a 3.00 to 4.99ct G SI1 lab grown heart diamond cost?

As of September 2026, 3.00 to 4.99ct G SI1 lab grown heart diamonds typically cost £354 GBP to £1,950 GBP, with a median price of £813 GBP. There are currently 26 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI1 heart diamond?

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3.00 to 4.99ct G SI1 Lab Grown Heart

Quick answer

As of September 2026, there are 26 lab grown heart diamonds with G colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £354 GBP to £1,950 GBP, with a median of £813 GBP. At least 25 retailers stock this exact specification. Half of all listings fall between £231 GBP and £646 GBP per carat. The same specification in natural form lists at a median of about £7,893 GBP per carat.

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. Heart lab grown stones in the index: 440 USD per carat, -9.4% 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

Available

Lowest Price

£271 GBP

Highest Price

£8,611 GBP

Average Price

£988 GBP

Market Intelligence

Retailers Selling

Price Spread

119.5%

Price Range

Price per carat distribution across retailers

$468/ct

10th Percentile

$224

Median

$468

90th Percentile

$1,318

Score Distribution

26 diamonds scored across 4 quality tiers

Excellent

6 (23.1%)

Very Good

4 (15.4%)

Good

5 (19.2%)

Average

11 (42.3%)

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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