How much does a 0.50 to 0.74ct H SI1 lab grown heart diamond cost?

As of October 2026, 0.50 to 0.74ct H SI1 lab grown heart diamonds typically cost £186 GBP to £529 GBP, with a median price of £251 GBP. There are currently 3 diamonds matching this specification available across retailers.

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

About 50% of these diamonds are available at multiple retailers, with an average price spread of 121%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct H SI1 Lab Grown Heart

Quick answer

As of October 2026, there are 3 lab grown heart diamonds with H colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run £186 GBP to £529 GBP, with a median of £251 GBP. At least 9 retailers stock this exact specification, and 50% of the stones appear at more than one of them, with an average price spread of 121%. Half of all listings fall between £286 GBP and £793 GBP per carat. The same specification in natural form lists at a median of about £777 GBP per carat.

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

£177 GBP

Highest Price

£981 GBP

Average Price

£327 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

50.0%

Price Spread

120.7%

Price Range

Price per carat distribution across retailers

$562/ct

10th Percentile

$372

Median

$562

90th Percentile

$1,344

Score Distribution

4 diamonds scored across 2 quality tiers

Excellent

1 (25.0%)

Very Good

3 (75.0%)

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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