How much does a 0.75 to 0.99ct G SI1 natural cushion diamond cost?

As of October 2026, 0.75 to 0.99ct G SI1 natural cushion diamonds typically cost $1,173 AUD to $4,484 AUD, with a median price of $2,345 AUD. There are currently 213 diamonds matching this specification available across retailers.

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

About 30% of these diamonds are available at multiple retailers, with an average price spread of 80%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct G SI1 Natural Cushion

Quick answer

As of October 2026, there are 213 natural cushion diamonds with G colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $1,173 AUD to $4,484 AUD, with a median of $2,345 AUD. At least 59 retailers stock this exact specification, and 30% of the stones appear at more than one of them, with an average price spread of 80%. Half of all listings fall between $1,994 AUD and $4,552 AUD per carat. The same specification in lab grown form lists at a median of about $1,042 AUD per carat. Over the last 30 days the median price moved -1.2% and the number of listings moved +3.0%.

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

213

Lowest Price

$843 AUD

Highest Price

$11,090 AUD

Average Price

$2,674 AUD