How much does a 5.00ct+ I SI2 natural oval diamond cost?

As of September 2026, 5.00ct+ I SI2 natural oval diamonds typically cost $54,997 NZD to $207,627 NZD, with a median price of $109,987 NZD. There are currently 134 diamonds matching this specification available across retailers.

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

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

5.00ct+ I SI2 Natural Oval

Quick answer

As of September 2026, there are 134 natural oval diamonds with I colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $54,997 NZD to $207,627 NZD, with a median of $109,987 NZD. At least 9 retailers stock this exact specification. Half of all listings fall between $39,943 NZD and $52,491 NZD per carat. The same specification in lab grown form lists at a median of about $26,703 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. Oval natural stones in the index: 2,380 USD per carat, -9.6% 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

134

Lowest Price

$30,899 NZD

Highest Price

$652,275 NZD

Average Price

$119,435 NZD