How much does a 5.00ct+ G SI1 lab grown radiant diamond cost?

As of September 2026, 5.00ct+ G SI1 lab grown radiant diamonds typically cost £552 GBP to £7,930 GBP, with a median price of £1,214 GBP. There are currently 80 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

5.00ct+ G SI1 Lab Grown Radiant

Quick answer

As of September 2026, there are 80 lab grown radiant diamonds with G colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £552 GBP to £7,930 GBP, with a median of £1,214 GBP. At least 10 retailers stock this exact specification. Half of all listings fall between £150 GBP and £511 GBP per carat. The same specification in natural form lists at a median of about £15,065 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. Radiant lab grown stones in the index: 473 USD per carat, -12.5% 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

£395 GBP

Highest Price

£146,832 GBP

Average Price

£3,696 GBP

Market Intelligence

Retailers Selling

Price Spread

136.4%

Price Range

Price per carat distribution across retailers

$358/ct

10th Percentile

$180

Median

$358

90th Percentile

$708

Score Distribution

80 diamonds scored across 4 quality tiers

Excellent

26 (32.5%)

Very Good

19 (23.8%)

Good

7 (8.8%)

Average

28 (35.0%)

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Save money without compromising on what matters. These alternatives are visually similar but cost less.

H SI1H colour is visually identical to G to the naked eye

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G SI2SI2 inclusions are not visible without magnification

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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