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

As of September 2026, 3.00 to 4.99ct G SI1 natural round diamonds typically cost $44,514 NZD to $129,213 NZD, with a median price of $78,293 NZD. There are currently 530 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct G SI1 Natural Round

Quick answer

As of September 2026, there are 530 natural round diamonds with G colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $44,514 NZD to $129,213 NZD, with a median of $78,293 NZD. At least 55 retailers stock this exact specification. Half of all listings fall between $21,345 NZD and $29,229 NZD per carat. The same specification in lab grown form lists at a median of about $561 NZD 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

530

Lowest Price

$27,794 NZD

Highest Price

$261,099 NZD

Average Price

$85,507 NZD