How much does a 3.00 to 4.99ct I IF natural radiant diamond cost?

As of September 2026, 3.00 to 4.99ct I IF natural radiant diamonds typically cost £21,661 GBP to £42,193 GBP, with a median price of £33,946 GBP. There are currently 5 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

3.00 to 4.99ct I IF Natural Radiant

Quick answer

As of September 2026, there are 5 natural radiant diamonds with I colour and IF clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £21,661 GBP to £42,193 GBP, with a median of £33,946 GBP. At least 8 retailers stock this exact specification. Half of all listings fall between £9,190 GBP and £12,760 GBP per carat. The same specification in lab grown form lists at a median of about £748 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

£17,151 GBP

Highest Price

£46,252 GBP

Average Price

£32,376 GBP