How much does a 1.00 to 1.49ct I IF lab grown radiant diamond cost?

As of September 2026, 1.00 to 1.49ct I IF lab grown radiant diamonds typically cost £3,063 GBP to £4,177 GBP, with a median price of £3,620 GBP. There are currently 2 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct I IF Lab Grown Radiant

Quick answer

As of September 2026, there are 2 lab grown radiant diamonds with I colour and IF clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £3,063 GBP to £4,177 GBP, with a median of £3,620 GBP. At least 15 retailers stock this exact specification. Half of all listings fall between £640 GBP and £1,189 GBP per carat. The same specification in natural form lists at a median of about £2,854 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. Radiant lab grown stones in the index: 473 USD per carat, -12.5% 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

£2,924 GBP

Highest Price

£4,316 GBP

Average Price

£3,620 GBP

Market Intelligence

Retailers Selling

Price Spread

57.7%

Price Range

Price per carat distribution across retailers

$1,284/ct

10th Percentile

$572

Median

$1,284

90th Percentile

$3,308

Score Distribution

2 diamonds scored across 1 quality tiers

Average

2 (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