How much does a 3.00 to 4.99ct D SI1 natural radiant diamond cost?

As of September 2026, 3.00 to 4.99ct D SI1 natural radiant diamonds typically cost £25,367 GBP to £66,822 GBP, with a median price of £39,510 GBP. There are currently 147 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct D SI1 Natural Radiant

Quick answer

As of September 2026, there are 147 natural radiant diamonds with D colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £25,367 GBP to £66,822 GBP, with a median of £39,510 GBP. At least 43 retailers stock this exact specification. Half of all listings fall between £9,253 GBP and £12,420 GBP per carat. The same specification in lab grown form lists at a median of about £271 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

147

Lowest Price

£13,662 GBP

Highest Price

£110,715 GBP

Average Price

£42,735 GBP

Market Intelligence

Retailers Selling

Price Spread

29.6%

Price Range

Price per carat distribution across retailers

$14,438/ct

10th Percentile

$10,630

Median

$14,438

90th Percentile

$19,038

Score Distribution

147 diamonds scored across 4 quality tiers

Excellent

22 (15.0%)

Very Good

33 (22.4%)

Good

46 (31.3%)

Average

46 (31.3%)

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Lab-Grown D 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