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

As of September 2026, 5.00ct+ G SI1 natural radiant diamonds typically cost £62,328 GBP to £162,714 GBP, with a median price of £96,045 GBP. There are currently 53 diamonds matching this specification available across retailers.

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

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5.00ct+ G SI1 Natural Radiant

Quick answer

As of September 2026, there are 53 natural radiant diamonds with G colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £62,328 GBP to £162,714 GBP, with a median of £96,045 GBP. At least 12 retailers stock this exact specification. Half of all listings fall between £11,942 GBP and £18,342 GBP per carat. The same specification in lab grown form lists at a median of about £254 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 natural stones in the index: 2,765 USD per carat, +6.0% 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

£49,680 GBP

Highest Price

£433,597 GBP

Average Price

£108,298 GBP

Market Intelligence

Retailers Selling

Price Spread

39.0%

Price Range

Price per carat distribution across retailers

$22,109/ct

10th Percentile

$14,937

Median

$22,109

90th Percentile

$29,606

Score Distribution

53 diamonds scored across 4 quality tiers

Excellent

6 (11.3%)

Very Good

10 (18.9%)

Good

20 (37.7%)

Average

17 (32.1%)

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Consider Instead

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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Lab-Grown G SI1Same specifications, lab-grown origin

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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