How much does a 1.00 to 1.49ct I FL natural round diamond cost?

As of September 2026, 1.00 to 1.49ct I FL natural round diamonds typically cost £3,012 GBP to £11,483 GBP, with a median price of £3,755 GBP. There are currently 86 diamonds matching this specification available across retailers.

Where can I find the best price on a I FL round diamond?

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1.00 to 1.49ct I FL Natural Round

Quick answer

As of September 2026, there are 86 natural round diamonds with I colour and FL clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £3,012 GBP to £11,483 GBP, with a median of £3,755 GBP. At least 20 retailers stock this exact specification. Half of all listings fall between £3,320 GBP and £4,174 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. Round natural stones in the index: 2,094 USD per carat, -3.8% 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

£2,517 GBP

Highest Price

£13,742 GBP

Average Price

£5,721 GBP

Market Intelligence

Retailers Selling

Price Spread

23.0%

Price Range

Price per carat distribution across retailers

$5,020/ct

10th Percentile

$4,072

Median

$5,020

90th Percentile

$12,013

Score Distribution

86 diamonds scored across 4 quality tiers

Excellent

9 (10.5%)

Very Good

16 (18.6%)

Good

35 (40.7%)

Average

26 (30.2%)

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Consider Instead

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

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I IFIF inclusions are not visible without magnification

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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