How much does a 2.00 to 2.99ct I SI1 natural cushion diamond cost?

As of October 2026, 2.00 to 2.99ct I SI1 natural cushion diamonds typically cost $6,653 USD to $21,718 USD, with a median price of $12,282 USD. There are currently 350 diamonds matching this specification available across retailers.

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

About 32% of these diamonds are available at multiple retailers, with an average price spread of 49%. A comparison tool like Carat Hunter lets you see all the prices side by side.

2.00 to 2.99ct I SI1 Natural Cushion

Quick answer

As of October 2026, there are 350 natural cushion diamonds with I color and SI1 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run $6,653 USD to $21,718 USD, with a median of $12,282 USD. At least 57 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 49%. Half of all listings fall between $4,473 USD and $7,340 USD per carat. The same specification in lab grown form lists at a median of about $1,116 USD per carat. Over the last 30 days the median price moved -1.5% 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

350

Lowest Price

$3,659 USD

Highest Price

$47,700 USD

Average Price

$13,643 USD