How much does a 1.50 to 1.99ct E SI1 natural cushion diamond cost?

As of October 2026, 1.50 to 1.99ct E SI1 natural cushion diamonds typically cost $7,788 NZD to $23,216 NZD, with a median price of $13,836 NZD. There are currently 214 diamonds matching this specification available across retailers.

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

About 28% 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.

1.50 to 1.99ct E SI1 Natural Cushion

Quick answer

As of October 2026, there are 214 natural cushion diamonds with E colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $7,788 NZD to $23,216 NZD, with a median of $13,836 NZD. At least 59 retailers stock this exact specification, and 28% of the stones appear at more than one of them, with an average price spread of 55%. Half of all listings fall between $6,835 NZD and $11,770 NZD per carat. The same specification in lab grown form lists at a median of about $764 NZD per carat. Over the last 30 days the median price moved -2.5% and the number of listings moved +4.8%.

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

214

Lowest Price

$5,434 NZD

Highest Price

$45,160 NZD

Average Price

$14,990 NZD