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

As of September 2026, 5.00ct+ I I1 lab grown round diamonds typically cost $55,836 AUD to $122,139 AUD, with a median price of $97,547 AUD. There are currently 3 diamonds matching this specification available across retailers.

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

About 27% of these diamonds are available at multiple retailers, with an average price spread of 154%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ I I1 Lab Grown Round

Quick answer

As of September 2026, there are 3 lab grown round diamonds with I colour and I1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $55,836 AUD to $122,139 AUD, with a median of $97,547 AUD. At least 5 retailers stock this exact specification, and 27% of the stones appear at more than one of them, with an average price spread of 154%. Half of all listings fall between $499 AUD and $2,394 AUD per carat. The same specification in natural form lists at a median of about $8,530 AUD per carat.

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 lab grown stones in the index: 438 USD per carat, -14.1% 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

$45,409 AUD

Highest Price

$128,287 AUD

Average Price

$90,414 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

27.3%

Price Spread

154.4%

Price Range

Price per carat distribution across retailers

$875/ct

10th Percentile

$277

Median

$875

90th Percentile

$2,596

Score Distribution

3 diamonds scored across 1 quality tiers

Average

3 (100.0%)

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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