How much does a 5.00ct+ G SI1 natural round diamond cost?

As of September 2026, 5.00ct+ G SI1 natural round diamonds typically cost $99,019 AUD to $309,232 AUD, with a median price of $161,925 AUD. There are currently 170 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

5.00ct+ G SI1 Natural Round

Quick answer

As of September 2026, there are 170 natural round diamonds with G colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $99,019 AUD to $309,232 AUD, with a median of $161,925 AUD. At least 15 retailers stock this exact specification. Half of all listings fall between $36,721 AUD and $59,058 AUD per carat. The same specification in lab grown form lists at a median of about $493 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. Round natural stones in the index: 2,094 USD per carat, -3.8% 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

170

Lowest Price

$54,150 AUD

Highest Price

$896,963 AUD

Average Price

$187,354 AUD