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

As of October 2026, 5.00ct+ I I1 natural round diamonds typically cost $45,518 NZD to $202,182 NZD, with a median price of $127,336 NZD. There are currently 11 diamonds matching this specification available across retailers.

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

About 25% of these diamonds are available at multiple retailers, with an average price spread of 101%. 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 October 2026, there are 11 natural round diamonds with I colour and I1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $45,518 NZD to $202,182 NZD, with a median of $127,336 NZD. At least 22 retailers stock this exact specification, and 25% of the stones appear at more than one of them, with an average price spread of 101%. Half of all listings fall between $8,392 NZD and $22,775 NZD per carat. Over the last 30 days the median price moved +25.4% and the number of listings moved +8.9%.

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

Lowest Price

$27,424 NZD

Highest Price

$340,004 NZD

Average Price

$124,561 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

24.8%

Price Spread

101.0%

30-Day Price Trend

+25.4%

30-Day Supply Change

+8.9%

Volatility (30d)

0.05

Price Range

Price per carat distribution across retailers

$8,029/ct

10th Percentile

$3,695

Median

$8,029

90th Percentile

$14,440

Score Distribution

43 diamonds scored across 4 quality tiers

Excellent

3 (7.0%)

Very Good

4 (9.3%)

Good

7 (16.3%)

Average

29 (67.4%)

Find Your Diamond

Search 11 I I1 round diamonds and compare prices.

Search Diamonds

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 29%

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