How much does a 3.00 to 4.99ct D SI1 natural princess diamond cost?

As of October 2026, 3.00 to 4.99ct D SI1 natural princess diamonds typically cost £20,927 GBP to £56,855 GBP, with a median price of £29,274 GBP. There are currently 11 diamonds matching this specification available across retailers.

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

About 27% of these diamonds are available at multiple retailers, with an average price spread of 27%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct D SI1 Natural Princess

Quick answer

As of October 2026, there are 11 natural princess diamonds with D colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £20,927 GBP to £56,855 GBP, with a median of £29,274 GBP. At least 49 retailers stock this exact specification, and 27% of the stones appear at more than one of them, with an average price spread of 27%. Half of all listings fall between £8,363 GBP and £10,988 GBP per carat. The same specification in lab grown form lists at a median of about £249 GBP per carat. Over the last 30 days the median price moved +2.0% and the number of listings moved +6.2%.

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. Princess natural stones in the index: 2,158 USD per carat, +5.7% 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

Lowest Price

£16,449 GBP

Highest Price

£147,943 GBP

Average Price

£37,489 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

26.7%

Price Spread

27.2%

30-Day Price Trend

+2.0%

30-Day Supply Change

+6.2%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$12,909/ct

10th Percentile

$9,631

Median

$12,909

90th Percentile

$17,560

Score Distribution

31 diamonds scored across 4 quality tiers

Excellent

4 (12.9%)

Very Good

6 (19.4%)

Good

5 (16.1%)

Average

16 (51.6%)

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Consider Instead

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

D SI2SI2 inclusions are not visible without magnification

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Lab-Grown D 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