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

As of October 2026, 5.00ct+ E SI1 natural princess diamonds typically cost £75,088 GBP to £102,848 GBP, with a median price of £88,363 GBP. There are currently 4 diamonds matching this specification available across retailers.

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

About 54% of these diamonds are available at multiple retailers, with an average price spread of 19%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ E SI1 Natural Princess

Quick answer

As of October 2026, there are 4 natural princess diamonds with E colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £75,088 GBP to £102,848 GBP, with a median of £88,363 GBP. At least 25 retailers stock this exact specification, and 54% of the stones appear at more than one of them, with an average price spread of 19%. Half of all listings fall between £16,693 GBP and £20,156 GBP per carat. The same specification in lab grown form lists at a median of about £192 GBP per carat. Over the last 30 days the median price moved +3.4% and the number of listings moved -3.6%.

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

£69,375 GBP

Highest Price

£141,744 GBP

Average Price

£88,752 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

53.9%

Price Spread

19.0%

30-Day Price Trend

+3.4%

30-Day Supply Change

-3.6%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$24,317/ct

10th Percentile

$20,975

Median

$24,317

90th Percentile

$28,882

Score Distribution

11 diamonds scored across 4 quality tiers

Excellent

4 (36.4%)

Very Good

1 (9.1%)

Good

1 (9.1%)

Average

5 (45.5%)

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Consider Instead

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

F SI1F colour is visually identical to E to the naked eye

Save 24%

Lab-Grown E SI1Same specifications, lab-grown origin

Save 99%

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