How much does a 1.00 to 1.49ct G SI2 lab grown heart diamond cost?

As of September 2026, 1.00 to 1.49ct G SI2 lab grown heart diamonds typically cost £754 GBP to £3,230 GBP, with a median price of £1,625 GBP. There are currently 25 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct G SI2 Lab Grown Heart

Quick answer

As of September 2026, there are 25 lab grown heart diamonds with G colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £754 GBP to £3,230 GBP, with a median of £1,625 GBP. At least 15 retailers stock this exact specification. Half of all listings fall between £922 GBP and £1,882 GBP per carat. The same specification in natural form lists at a median of about £1,670 GBP per carat.

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

£203 GBP

Highest Price

£3,836 GBP

Average Price

£1,810 GBP

Market Intelligence

Retailers Selling

Price Spread

60.7%

Price Range

Price per carat distribution across retailers

$2,137/ct

10th Percentile

$1,035

Median

$2,137

90th Percentile

$4,094

Score Distribution

25 diamonds scored across 3 quality tiers

Very Good

5 (20.0%)

Good

4 (16.0%)

Average

16 (64.0%)

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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