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

As of September 2026, 5.00ct+ G I1 natural round diamonds typically cost $22,676 AUD to $120,976 AUD, with a median price of $57,673 AUD. There are currently 30 diamonds matching this specification available across retailers.

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

About 60% of these diamonds are available at multiple retailers, with an average price spread of 86%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ G I1 Natural Round

Quick answer

As of September 2026, there are 30 natural round diamonds with G colour and I1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $22,676 AUD to $120,976 AUD, with a median of $57,673 AUD. At least 9 retailers stock this exact specification, and 60% of the stones appear at more than one of them, with an average price spread of 86%. Half of all listings fall between $5,549 AUD and $13,941 AUD per carat. The same specification in lab grown form lists at a median of about $11,958 AUD 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. 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

$17,310 AUD

Highest Price

$183,439 AUD

Average Price

$67,099 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

60.0%

Price Spread

86.3%

Price Range

Price per carat distribution across retailers

$6,925/ct

10th Percentile

$2,057

Median

$6,925

90th Percentile

$11,479

Score Distribution

30 diamonds scored across 3 quality tiers

Very Good

11 (36.7%)

Good

4 (13.3%)

Average

15 (50.0%)

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H I1H colour is visually identical to G to the naked eye

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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