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

As of November 2026, 1.00 to 1.49ct G SI1 natural radiant diamonds typically cost $2,570 AUD to $8,212 AUD, with a median price of $4,211 AUD. There are currently 239 diamonds matching this specification available across retailers.

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

About 38% of these diamonds are available at multiple retailers, with an average price spread of 51%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct G SI1 Natural Radiant

Quick answer

As of November 2026, there are 239 natural radiant diamonds with G colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,570 AUD to $8,212 AUD, with a median of $4,211 AUD. At least 61 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 51%. Half of all listings fall between $3,314 AUD and $5,347 AUD per carat. The same specification in lab grown form lists at a median of about $638 AUD per carat. Over the last 30 days the median price moved -0.1% and the number of listings moved +16.0%.

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. Radiant natural stones in the index: 3,108 USD per carat, +0.3% 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

239

Lowest Price

$827 AUD

Highest Price

$17,599 AUD

Average Price

$4,846 AUD