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 $67,348 CAD to $257,445 CAD, with a median price of $102,523 CAD. 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 color and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $67,348 CAD to $257,445 CAD, with a median of $102,523 CAD. At least 8 retailers stock this exact specification. Half of all listings fall between $31,907 CAD and $47,622 CAD per carat. The same specification in lab grown form lists at a median of about $3,823 CAD 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

$30,092 CAD

Highest Price

$611,287 CAD

Average Price

$139,785 CAD