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

As of October 2026, 3.00 to 4.99ct J SI2 natural round diamonds typically cost £12,319 GBP to £37,943 GBP, with a median price of £21,890 GBP. There are currently 513 diamonds matching this specification available across retailers.

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

About 42% of these diamonds are available at multiple retailers, with an average price spread of 42%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct J SI2 Natural Round

Quick answer

As of October 2026, there are 513 natural round diamonds with J colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £12,319 GBP to £37,943 GBP, with a median of £21,890 GBP. At least 50 retailers stock this exact specification, and 42% of the stones appear at more than one of them, with an average price spread of 42%. Half of all listings fall between £4,630 GBP and £7,089 GBP per carat. The same specification in lab grown form lists at a median of about £2,193 GBP per carat. Over the last 30 days the median price moved -1.1% and the number of listings moved +8.5%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Round natural stones in the index: 2,248 USD per carat, +7.6% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: October 2026

Available

513

Lowest Price

£6,683 GBP

Highest Price

£71,826 GBP

Average Price

£23,789 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

41.7%

Price Spread

41.8%

30-Day Price Trend

-1.1%

30-Day Supply Change

+8.5%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$7,830/ct

10th Percentile

$4,825

Median

$7,830

90th Percentile

$10,951

Score Distribution

1.3K diamonds scored across 4 quality tiers

Excellent

189 (14.0%)

Very Good

340 (25.2%)

Good

227 (16.9%)

Average

591 (43.9%)

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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

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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