How much does a 1.00 to 1.49ct E SI1 lab grown princess diamond cost?

As of October 2026, 1.00 to 1.49ct E SI1 lab grown princess diamonds typically cost £112 GBP to £629 GBP, with a median price of £293 GBP. There are currently 91 diamonds matching this specification available across retailers.

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

About 42% of these diamonds are available at multiple retailers, with an average price spread of 106%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct E SI1 Lab Grown Princess

Quick answer

As of October 2026, there are 91 lab grown princess diamonds with E colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £112 GBP to £629 GBP, with a median of £293 GBP. At least 36 retailers stock this exact specification, and 42% of the stones appear at more than one of them, with an average price spread of 106%. Half of all listings fall between £151 GBP and £427 GBP per carat. The same specification in natural form lists at a median of about £2,435 GBP per carat. Over the last 30 days the median price moved -6.3% and the number of listings moved +62.6%.

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 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

£81 GBP

Highest Price

£1,209 GBP

Average Price

£333 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

41.5%

Price Spread

106.3%

30-Day Price Trend

-6.3%

30-Day Supply Change

+62.6%

Volatility (30d)

0.03

Price Range

Price per carat distribution across retailers

$347/ct

10th Percentile

$154

Median

$347

90th Percentile

$851

Score Distribution

186 diamonds scored across 4 quality tiers

Excellent

44 (23.7%)

Very Good

20 (10.8%)

Good

52 (28.0%)

Average

70 (37.6%)

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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