How much does a 5.00ct+ H I1 lab grown round diamond cost?

As of September 2026, 5.00ct+ H I1 lab grown round diamonds typically cost £1,224 GBP to £40,669 GBP, with a median price of £1,634 GBP. There are currently 5 diamonds matching this specification available across retailers.

Where can I find the best price on a H I1 round diamond?

About 27% of these diamonds are available at multiple retailers, with an average price spread of 154%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ H I1 Lab Grown Round

Quick answer

As of September 2026, there are 5 lab grown round diamonds with H colour and I1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £1,224 GBP to £40,669 GBP, with a median of £1,634 GBP. At least 5 retailers stock this exact specification, and 27% of the stones appear at more than one of them, with an average price spread of 154%. Half of all listings fall between £280 GBP and £1,344 GBP per carat. The same specification in natural form lists at a median of about £4,788 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. Round lab grown stones in the index: 438 USD per carat, -14.1% 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

£1,138 GBP

Highest Price

£50,111 GBP

Average Price

£16,148 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

27.3%

Price Spread

154.4%

Price Range

Price per carat distribution across retailers

$875/ct

10th Percentile

$277

Median

$875

90th Percentile

$2,596

Score Distribution

5 diamonds scored across 3 quality tiers

Very Good

1 (20.0%)

Good

3 (60.0%)

Average

1 (20.0%)

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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