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

As of October 2026, 5.00ct+ E SI1 lab grown princess diamonds typically cost £543 GBP to £1,388 GBP, with a median price of £640 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 50% of these diamonds are available at multiple retailers, with an average price spread of 115%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ E SI1 Lab Grown Princess

Quick answer

As of October 2026, there are 4 lab grown princess diamonds with E colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £543 GBP to £1,388 GBP, with a median of £640 GBP. At least 22 retailers stock this exact specification, and 50% of the stones appear at more than one of them, with an average price spread of 115%. Half of all listings fall between £137 GBP and £358 GBP per carat. The same specification in natural form lists at a median of about £18,260 GBP per carat.

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 lab grown stones in the index: 461 USD per carat, -4.8% 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

£502 GBP

Highest Price

£5,752 GBP

Average Price

£873 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

50.0%

Price Spread

114.6%

Price Range

Price per carat distribution across retailers

$256/ct

10th Percentile

$151

Median

$256

90th Percentile

$716

Score Distribution

5 diamonds scored across 3 quality tiers

Excellent

3 (60.0%)

Good

1 (20.0%)

Average

1 (20.0%)

Find Your Diamond

Search 4 E SI1 princess diamonds and compare prices.

Search Diamonds

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 14%

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