How much does a 1.00 to 1.49ct G SI1 natural cushion diamond cost?

As of November 2026, 1.00 to 1.49ct G SI1 natural cushion diamonds typically cost $2,082 AUD to $6,466 AUD, with a median price of $3,681 AUD. There are currently 531 diamonds matching this specification available across retailers.

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

About 34% of these diamonds are available at multiple retailers, with an average price spread of 59%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct G SI1 Natural Cushion

Quick answer

As of November 2026, there are 531 natural cushion diamonds with G colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,082 AUD to $6,466 AUD, with a median of $3,681 AUD. At least 61 retailers stock this exact specification, and 34% of the stones appear at more than one of them, with an average price spread of 59%. Half of all listings fall between $2,706 AUD and $4,888 AUD per carat. The same specification in lab grown form lists at a median of about $705 AUD per carat. Over the last 30 days the median price moved -1.2% and the number of listings moved +5.0%.

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

531

Lowest Price

$1,508 AUD

Highest Price

$13,565 AUD

Average Price

$4,046 AUD