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

As of September 2026, 3.00 to 4.99ct J SI1 natural radiant diamonds typically cost £14,344 GBP to £40,011 GBP, with a median price of £25,197 GBP. There are currently 178 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

3.00 to 4.99ct J SI1 Natural Radiant

Quick answer

As of September 2026, there are 178 natural radiant diamonds with J colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £14,344 GBP to £40,011 GBP, with a median of £25,197 GBP. At least 32 retailers stock this exact specification. Half of all listings fall between £4,469 GBP and £6,297 GBP per carat. The same specification in lab grown form lists at a median of about £1,052 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

178

Lowest Price

£10,905 GBP

Highest Price

£68,176 GBP

Average Price

£27,003 GBP

Market Intelligence

Retailers Selling

Price Spread

33.5%

Price Range

Price per carat distribution across retailers

$7,381/ct

10th Percentile

$5,102

Median

$7,381

90th Percentile

$9,352

Score Distribution

178 diamonds scored across 4 quality tiers

Excellent

5 (2.8%)

Very Good

58 (32.6%)

Good

49 (27.5%)

Average

66 (37.1%)

Find Your Diamond

Search 178 J SI1 radiant diamonds and compare prices.

Search Diamonds

Consider Instead

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

J SI2SI2 inclusions are not visible without magnification

Save 38%

Lab-Grown J SI1Same specifications, lab-grown origin

Save 89%

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