How much does a 3.00 to 4.99ct G SI1 natural cushion diamond cost?

As of September 2026, 3.00 to 4.99ct G SI1 natural cushion diamonds typically cost $47,085 AUD to $103,311 AUD, with a median price of $63,737 AUD. There are currently 262 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct G SI1 Natural Cushion

Quick answer

As of September 2026, there are 262 natural cushion diamonds with G colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $47,085 AUD to $103,311 AUD, with a median of $63,737 AUD. At least 47 retailers stock this exact specification. Half of all listings fall between $18,164 AUD and $24,612 AUD per carat. The same specification in lab grown form lists at a median of about $577 AUD 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

262

Lowest Price

$24,250 AUD

Highest Price

$196,795 AUD

Average Price

$69,599 AUD