How much does a 0.50 to 0.74ct I I1 natural radiant diamond cost?

As of October 2026, 0.50 to 0.74ct I I1 natural radiant diamonds typically cost £423 GBP to £698 GBP, with a median price of £575 GBP. There are currently 13 diamonds matching this specification available across retailers.

Where can I find the best price on a I I1 radiant diamond?

About 5% of these diamonds are available at multiple retailers, with an average price spread of 15%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct I I1 Natural Radiant

Quick answer

As of October 2026, there are 13 natural radiant diamonds with I colour and I1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run £423 GBP to £698 GBP, with a median of £575 GBP. At least 19 retailers stock this exact specification, and 5% of the stones appear at more than one of them, with an average price spread of 15%. Half of all listings fall between £863 GBP and £999 GBP per carat. Over the last 30 days the median price moved -0.2% and the number of listings moved +1.3%.

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

£265 GBP

Highest Price

£1,040 GBP

Average Price

£579 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

5.4%

Price Spread

14.6%

30-Day Price Trend

-0.2%

30-Day Supply Change

+1.3%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,249/ct

10th Percentile

$1,044

Median

$1,249

90th Percentile

$1,425

Score Distribution

96 diamonds scored across 4 quality tiers

Excellent

3 (3.1%)

Very Good

4 (4.2%)

Good

8 (8.3%)

Average

81 (84.4%)

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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