How much does a 0.20 to 0.49ct E SI1 natural cushion diamond cost?

As of October 2026, 0.20 to 0.49ct E SI1 natural cushion diamonds typically cost €249 EUR to €626 EUR, with a median price of €399 EUR. There are currently 128 diamonds matching this specification available across retailers.

Where can I find the best price on a E SI1 cushion diamond?

About 36% of these diamonds are available at multiple retailers, with an average price spread of 35%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct E SI1 Natural Cushion

Quick answer

As of October 2026, there are 128 natural cushion diamonds with E colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run €249 EUR to €626 EUR, with a median of €399 EUR. At least 17 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 35%. Half of all listings fall between €1,198 EUR and €1,674 EUR per carat. The same specification in lab grown form lists at a median of about €585 EUR per carat. Over the last 30 days the median price moved -0.3% and the number of listings moved +6.0%.

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. Cushion natural stones in the index: 2,948 USD per carat, +1.7% 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

128

Lowest Price

€149 EUR

Highest Price

€1,427 EUR

Average Price

€429 EUR