How much does a 5.00ct+ I SI2 natural cushion diamond cost?

As of September 2026, 5.00ct+ I SI2 natural cushion diamonds typically cost €41,937 EUR to €160,308 EUR, with a median price of €63,793 EUR. There are currently 84 diamonds matching this specification available across retailers.

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

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

5.00ct+ I SI2 Natural Cushion

Quick answer

As of September 2026, there are 84 natural cushion diamonds with I colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run €41,937 EUR to €160,308 EUR, with a median of €63,793 EUR. At least 8 retailers stock this exact specification. Half of all listings fall between €19,868 EUR and €29,653 EUR per carat. The same specification in lab grown form lists at a median of about €2,380 EUR 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. Cushion natural stones in the index: 2,792 USD per carat, +1.1% 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

€18,738 EUR

Highest Price

€380,641 EUR

Average Price

€87,196 EUR