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

As of September 2026, 1.00 to 1.49ct I IF natural radiant diamonds typically cost £1,625 GBP to £3,743 GBP, with a median price of £2,417 GBP. There are currently 82 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 Natural Radiant

Quick answer

As of September 2026, there are 82 natural radiant diamonds with I colour and IF clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,625 GBP to £3,743 GBP, with a median of £2,417 GBP. At least 49 retailers stock this exact specification. Half of all listings fall between £1,892 GBP and £3,021 GBP per carat. The same specification in lab grown form lists at a median of about £1,009 GBP per carat.

Three of the best scored stones at this specification right now:

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 natural stones in the index: 2,765 USD per carat, +6.0% 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

£1,317 GBP

Highest Price

£5,570 GBP

Average Price

£2,560 GBP

Market Intelligence

Retailers Selling

Price Spread

48.3%

Price Range

Price per carat distribution across retailers

$3,156/ct

10th Percentile

$2,152

Median

$3,156

90th Percentile

$4,974

Score Distribution

82 diamonds scored across 4 quality tiers

Excellent

15 (18.3%)

Very Good

21 (25.6%)

Good

25 (30.5%)

Average

21 (25.6%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

J IFJ colour is visually identical to I to the naked eye

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Lab-Grown I IFSame specifications, lab-grown origin

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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