How much does a 0.50 to 0.74ct I SI2 natural radiant diamond cost?

As of November 2026, 0.50 to 0.74ct I SI2 natural radiant diamonds typically cost €541 EUR to €1,039 EUR, with a median price of €735 EUR. There are currently 28 diamonds matching this specification available across retailers.

Where can I find the best price on a I SI2 radiant diamond?

About 21% of these diamonds are available at multiple retailers, with an average price spread of 55%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct I SI2 Natural Radiant

Quick answer

As of November 2026, there are 28 natural radiant diamonds with I color and SI2 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run €541 EUR to €1,039 EUR, with a median of €735 EUR. At least 41 retailers stock this exact specification, and 21% of the stones appear at more than one of them, with an average price spread of 55%. Half of all listings fall between €1,061 EUR and €1,768 EUR per carat. The same specification in lab grown form lists at a median of about €584 EUR per carat. Over the last 30 days the median price moved +0.8% and the number of listings moved +4.3%.

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: November 2026

Available

Lowest Price

€349 EUR

Highest Price

€2,822 EUR

Average Price

€774 EUR