How much does a 5.00ct+ I I1 natural round diamond cost?

As of September 2026, 5.00ct+ I I1 natural round diamonds typically cost $29,998 NZD to $199,857 NZD, with a median price of $83,135 NZD. There are currently 41 diamonds matching this specification available across retailers.

Where can I find the best price on a I I1 round diamond?

About 51% of these diamonds are available at multiple retailers, with an average price spread of 75%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ I I1 Natural Round

Quick answer

As of September 2026, there are 41 natural round diamonds with I colour and I1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $29,998 NZD to $199,857 NZD, with a median of $83,135 NZD. At least 14 retailers stock this exact specification, and 51% of the stones appear at more than one of them, with an average price spread of 75%. Half of all listings fall between $6,588 NZD and $13,360 NZD per carat. The same specification in lab grown form lists at a median of about $1,521 NZD per carat. Over the last 30 days the median price moved -35.2% and the number of listings moved -50.7%.

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

Lowest Price

$25,651 NZD

Highest Price

$332,837 NZD

Average Price

$100,598 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

51.1%

Price Spread

75.0%

30-Day Price Trend

-35.2%

30-Day Supply Change

-50.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$5,201/ct

10th Percentile

$3,329

Median

$5,201

90th Percentile

$10,761

Score Distribution

41 diamonds scored across 4 quality tiers

Excellent

2 (4.9%)

Very Good

9 (22.0%)

Good

10 (24.4%)

Average

20 (48.8%)

Find Your Diamond

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

J I1J colour is visually identical to I to the naked eye

Save 13%

Lab-Grown I I1Same specifications, lab-grown origin

Save 83%

Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1