How much does a 5.00ct+ J SI1 natural princess diamond cost?

As of September 2026, 5.00ct+ J SI1 natural princess diamonds typically cost £31,509 GBP to £80,826 GBP, with a median price of £47,961 GBP. There are currently 28 diamonds matching this specification available across retailers.

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

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5.00ct+ J SI1 Natural Princess

Quick answer

As of September 2026, there are 28 natural princess diamonds with J colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £31,509 GBP to £80,826 GBP, with a median of £47,961 GBP. At least 10 retailers stock this exact specification. Half of all listings fall between £17,138 GBP and £21,095 GBP per carat. The same specification in lab grown form lists at a median of about £1,471 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. Princess natural stones in the index: 2,073 USD per carat, -3.2% 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

Lowest Price

£27,235 GBP

Highest Price

£213,205 GBP

Average Price

£56,389 GBP

Market Intelligence

Retailers Selling

Price Spread

19.2%

Price Range

Price per carat distribution across retailers

$27,737/ct

10th Percentile

$14,064

Median

$27,737

90th Percentile

$29,123

Score Distribution

28 diamonds scored across 4 quality tiers

Excellent

3 (10.7%)

Very Good

5 (17.9%)

Good

10 (35.7%)

Average

10 (35.7%)

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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

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Lab-Grown J 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