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 $32,714 AUD to $159,492 AUD, with a median price of $102,153 AUD. 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 98%. 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 $32,714 AUD to $159,492 AUD, with a median of $102,153 AUD. 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 98%. Half of all listings fall between $6,911 AUD and $18,550 AUD per carat. The same specification in lab grown form lists at a median of about $451 AUD per carat. Over the last 30 days the median price moved +17.9% 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

$22,000 AUD

Highest Price

$272,762 AUD

Average Price

$98,369 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

24.8%

Price Spread

97.7%

30-Day Price Trend

+17.9%

30-Day Supply Change

+8.9%

Volatility (30d)

0.06

Price Range

Price per carat distribution across retailers

$8,366/ct

10th Percentile

$3,907

Median

$8,366

90th Percentile

$14,822

Score Distribution

44 diamonds scored across 4 quality tiers

Excellent

3 (6.8%)

Very Good

4 (9.1%)

Good

8 (18.2%)

Average

29 (65.9%)

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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 38%

Lab-Grown I I1Same specifications, lab-grown origin

Save 96%

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