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

As of November 2026, 5.00ct+ G SI1 natural cushion diamonds typically cost $116,966 NZD to $281,834 NZD, with a median price of $182,665 NZD. 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 33% of these diamonds are available at multiple retailers, with an average price spread of 41%. 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 November 2026, there are 35 natural cushion diamonds with G colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $116,966 NZD to $281,834 NZD, with a median of $182,665 NZD. At least 36 retailers stock this exact specification, and 33% of the stones appear at more than one of them, with an average price spread of 41%. Half of all listings fall between $26,617 NZD and $41,123 NZD per carat. The same specification in lab grown form lists at a median of about $538 NZD per carat. Over the last 30 days the median price moved 0.0% and the number of listings moved 0.0%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Cushion natural stones in the index: 2,881 USD per carat, -2.5% 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: November 2026

Available

Lowest Price

$67,190 NZD

Highest Price

$674,905 NZD

Average Price

$196,992 NZD