How much does a 3.00 to 4.99ct G SI2 natural cushion diamond cost?

As of October 2026, 3.00 to 4.99ct G SI2 natural cushion diamonds typically cost $27,163 AUD to $83,310 AUD, with a median price of $51,433 AUD. There are currently 96 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI2 cushion diamond?

About 41% 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.

3.00 to 4.99ct G SI2 Natural Cushion

Quick answer

As of October 2026, there are 96 natural cushion diamonds with G colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $27,163 AUD to $83,310 AUD, with a median of $51,433 AUD. At least 50 retailers stock this exact specification, and 41% of the stones appear at more than one of them, with an average price spread of 41%. Half of all listings fall between $11,806 AUD and $18,014 AUD per carat. The same specification in lab grown form lists at a median of about $498 AUD per carat. Over the last 30 days the median price moved -0.6% and the number of listings moved +15.3%.

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

$18,757 AUD

Highest Price

$186,779 AUD

Average Price

$56,848 AUD