How much does a 3.00 to 4.99ct G SI2 natural round diamond cost?

As of October 2026, 3.00 to 4.99ct G SI2 natural round diamonds typically cost $35,458 NZD to $112,916 NZD, with a median price of $67,290 NZD. There are currently 361 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI2 round diamond?

About 37% of these diamonds are available at multiple retailers, with an average price spread of 46%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct G SI2 Natural Round

Quick answer

As of October 2026, there are 361 natural round diamonds with G colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $35,458 NZD to $112,916 NZD, with a median of $67,290 NZD. At least 57 retailers stock this exact specification, and 37% of the stones appear at more than one of them, with an average price spread of 46%. Half of all listings fall between $15,591 NZD and $24,774 NZD per carat. The same specification in lab grown form lists at a median of about $646 NZD per carat. Over the last 30 days the median price moved -1.5% and the number of listings moved +8.1%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

361

Lowest Price

$17,844 NZD

Highest Price

$227,574 NZD

Average Price

$72,823 NZD