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

As of September 2026, 3.00 to 4.99ct J SI2 natural round diamonds typically cost £10,279 GBP to £33,693 GBP, with a median price of £19,363 GBP. There are currently 1,369 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct J SI2 Natural Round

Quick answer

As of September 2026, there are 1,369 natural round diamonds with J colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £10,279 GBP to £33,693 GBP, with a median of £19,363 GBP. At least 45 retailers stock this exact specification. Half of all listings fall between £4,451 GBP and £7,284 GBP per carat. The same specification in lab grown form lists at a median of about £2,630 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

1,369

Lowest Price

£4,907 GBP

Highest Price

£75,219 GBP

Average Price

£20,913 GBP

Market Intelligence

Retailers Selling

Price Spread

47.0%

Price Range

Price per carat distribution across retailers

$7,652/ct

10th Percentile

$4,375

Median

$7,652

90th Percentile

$10,642

Score Distribution

1.4K diamonds scored across 4 quality tiers

Excellent

218 (15.9%)

Very Good

459 (33.5%)

Good

399 (29.1%)

Average

293 (21.4%)

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Consider Instead

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

J I1I1 inclusions are not visible without magnification

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Lab-Grown J SI2Same specifications, lab-grown origin

Save 49%

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