How much does a 3.00 to 4.99ct E SI1 natural cushion diamond cost?

As of October 2026, 3.00 to 4.99ct E SI1 natural cushion diamonds typically cost $51,916 NZD to $145,867 NZD, with a median price of $83,349 NZD. There are currently 94 diamonds matching this specification available across retailers.

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

About 38% of these diamonds are available at multiple retailers, with an average price spread of 34%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct E SI1 Natural Cushion

Quick answer

As of October 2026, there are 94 natural cushion diamonds with E colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $51,916 NZD to $145,867 NZD, with a median of $83,349 NZD. At least 54 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 34%. Half of all listings fall between $22,388 NZD and $31,573 NZD per carat. The same specification in lab grown form lists at a median of about $705 NZD per carat. Over the last 30 days the median price moved -1.4% and the number of listings moved +9.3%.

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. 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

Lowest Price

$36,097 NZD

Highest Price

$249,779 NZD

Average Price

$90,778 NZD