How much does a 1.00 to 1.49ct J I1 lab grown princess diamond cost?

As of September 2026, 1.00 to 1.49ct J I1 lab grown princess diamonds typically cost £2,032 GBP to £2,418 GBP, with a median price of £2,091 GBP. There are currently 8 diamonds matching this specification available across retailers.

Where can I find the best price on a J I1 princess diamond?

About 10% of these diamonds are available at multiple retailers, with an average price spread of 36%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J I1 Lab Grown Princess

Quick answer

As of September 2026, there are 8 lab grown princess diamonds with J colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £2,032 GBP to £2,418 GBP, with a median of £2,091 GBP. At least 8 retailers stock this exact specification, and 10% of the stones appear at more than one of them, with an average price spread of 36%. Half of all listings fall between £673 GBP and £928 GBP per carat. The same specification in natural form lists at a median of about £1,410 GBP per carat.

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Princess lab grown stones in the index: 481 USD per carat, -7.3% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

Lowest Price

£2,027 GBP

Highest Price

£2,496 GBP

Average Price

£2,178 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

10.0%

Price Spread

35.9%

Price Range

Price per carat distribution across retailers

$960/ct

10th Percentile

$841

Median

$960

90th Percentile

$2,641

Score Distribution

8 diamonds scored across 1 quality tiers

Average

8 (100.0%)

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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