How much does a 0.50 to 0.74ct E SI1 lab grown princess diamond cost?

As of October 2026, 0.50 to 0.74ct E SI1 lab grown princess diamonds typically cost £128 GBP to £502 GBP, with a median price of £401 GBP. There are currently 13 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 104%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct E SI1 Lab Grown Princess

Quick answer

As of October 2026, there are 13 lab grown princess diamonds with E colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run £128 GBP to £502 GBP, with a median of £401 GBP. At least 25 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 104%. Half of all listings fall between £219 GBP and £642 GBP per carat. The same specification in natural form lists at a median of about £974 GBP per carat. Over the last 30 days the median price moved -13.9% and the number of listings moved +9.3%.

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

£90 GBP

Highest Price

£1,145 GBP

Average Price

£379 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

35.7%

Price Spread

104.4%

30-Day Price Trend

-13.9%

30-Day Supply Change

+9.3%

Volatility (30d)

0.04

Price Range

Price per carat distribution across retailers

$538/ct

10th Percentile

$221

Median

$538

90th Percentile

$1,154

Score Distribution

25 diamonds scored across 4 quality tiers

Excellent

3 (12.0%)

Very Good

2 (8.0%)

Good

5 (20.0%)

Average

15 (60.0%)

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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