How much does a 1.00 to 1.49ct J SI2 lab grown radiant diamond cost?

As of October 2026, 1.00 to 1.49ct J SI2 lab grown radiant diamonds typically cost £561 GBP to £972 GBP, with a median price of £721 GBP. There are currently 2 diamonds matching this specification available across retailers.

Where can I find the best price on a J SI2 radiant diamond?

About 33% 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.

1.00 to 1.49ct J SI2 Lab Grown Radiant

Quick answer

As of October 2026, there are 2 lab grown radiant diamonds with J colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £561 GBP to £972 GBP, with a median of £721 GBP. At least 11 retailers stock this exact specification, and 33% of the stones appear at more than one of them, with an average price spread of 104%. Half of all listings fall between £645 GBP and £1,353 GBP per carat. The same specification in natural form lists at a median of about £1,666 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. Radiant lab grown stones in the index: 474 USD per carat, -2.1% 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

£500 GBP

Highest Price

£2,553 GBP

Average Price

£754 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

33.3%

Price Spread

104.5%

Price Range

Price per carat distribution across retailers

$908/ct

10th Percentile

$783

Median

$908

90th Percentile

$2,553

Score Distribution

4 diamonds scored across 3 quality tiers

Very Good

1 (25.0%)

Good

1 (25.0%)

Average

2 (50.0%)

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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