How much does a 5.00ct+ D SI2 natural round diamond cost?

As of September 2026, 5.00ct+ D SI2 natural round diamonds typically cost £49,985 GBP to £155,271 GBP, with a median price of £80,540 GBP. There are currently 127 diamonds matching this specification available across retailers.

Where can I find the best price on a D SI2 round diamond?

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5.00ct+ D SI2 Natural Round

Quick answer

As of September 2026, there are 127 natural round diamonds with D colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £49,985 GBP to £155,271 GBP, with a median of £80,540 GBP. At least 39 retailers stock this exact specification. Half of all listings fall between £12,638 GBP and £16,935 GBP per carat. The same specification in lab grown form lists at a median of about £373 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 natural stones in the index: 2,094 USD per carat, -3.8% 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

127

Lowest Price

£29,877 GBP

Highest Price

£1,317,875 GBP

Average Price

£107,831 GBP

Market Intelligence

Retailers Selling

Price Spread

29.1%

Price Range

Price per carat distribution across retailers

$18,743/ct

10th Percentile

$12,119

Median

$18,743

90th Percentile

$23,891

Score Distribution

127 diamonds scored across 4 quality tiers

Excellent

47 (37.0%)

Very Good

28 (22.0%)

Good

27 (21.3%)

Average

25 (19.7%)

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Lab-Grown D SI2Same 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