How much does a 5.00ct+ G SI1 natural cushion diamond cost?

As of October 2026, 5.00ct+ G SI1 natural cushion diamonds typically cost $98,364 CAD to $219,865 CAD, with a median price of $146,194 CAD. There are currently 35 diamonds matching this specification available across retailers.

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

About 32% of these diamonds are available at multiple retailers, with an average price spread of 33%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ G SI1 Natural Cushion

Quick answer

As of October 2026, there are 35 natural cushion diamonds with G color and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $98,364 CAD to $219,865 CAD, with a median of $146,194 CAD. At least 41 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 33%. Half of all listings fall between $22,094 CAD and $31,052 CAD per carat. The same specification in lab grown form lists at a median of about $433 CAD per carat. Over the last 30 days the median price moved +0.3% and the number of listings moved -2.7%.

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

$53,165 CAD

Highest Price

$387,939 CAD

Average Price

$155,156 CAD