How much does a 3.00 to 4.99ct J SI2 natural radiant diamond cost?

As of September 2026, 3.00 to 4.99ct J SI2 natural radiant diamonds typically cost £11,896 GBP to £32,340 GBP, with a median price of £17,551 GBP. There are currently 123 diamonds matching this specification available across retailers.

Where can I find the best price on a J SI2 radiant diamond?

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3.00 to 4.99ct J SI2 Natural Radiant

Quick answer

As of September 2026, there are 123 natural radiant diamonds with J colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £11,896 GBP to £32,340 GBP, with a median of £17,551 GBP. At least 18 retailers stock this exact specification. Half of all listings fall between £3,055 GBP and £4,017 GBP per carat. The same specification in lab grown form lists at a median of about £2,553 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

123

Lowest Price

£6,544 GBP

Highest Price

£42,967 GBP

Average Price

£19,513 GBP

Market Intelligence

Retailers Selling

Price Spread

28.6%

Price Range

Price per carat distribution across retailers

$4,549/ct

10th Percentile

$3,780

Median

$4,549

90th Percentile

$7,944

Score Distribution

123 diamonds scored across 4 quality tiers

Excellent

7 (5.7%)

Very Good

49 (39.8%)

Good

18 (14.6%)

Average

49 (39.8%)

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Consider Instead

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

Lab-Grown J SI2Same specifications, lab-grown origin

Save 24%

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