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

As of October 2026, 1.00 to 1.49ct I IF natural radiant diamonds typically cost £1,536 GBP to £4,440 GBP, with a median price of £2,420 GBP. There are currently 29 diamonds matching this specification available across retailers.

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

About 35% of these diamonds are available at multiple retailers, with an average price spread of 64%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct I IF Natural Radiant

Quick answer

As of October 2026, there are 29 natural radiant diamonds with I colour and IF clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,536 GBP to £4,440 GBP, with a median of £2,420 GBP. At least 51 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 64%. Half of all listings fall between £2,002 GBP and £3,728 GBP per carat. The same specification in lab grown form lists at a median of about £986 GBP per carat. Over the last 30 days the median price moved +2.8% and the number of listings moved +26.5%.

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 natural stones in the index: 3,091 USD per carat, +13.2% 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

£1,185 GBP

Highest Price

£7,926 GBP

Average Price

£2,633 GBP