How much does a 5.00ct+ H SI2 natural round diamond cost?

As of October 2026, 5.00ct+ H SI2 natural round diamonds typically cost $72,891 AUD to $247,423 AUD, with a median price of $130,410 AUD. There are currently 100 diamonds matching this specification available across retailers.

Where can I find the best price on a H SI2 round diamond?

About 44% of these diamonds are available at multiple retailers, with an average price spread of 30%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ H SI2 Natural Round

Quick answer

As of October 2026, there are 100 natural round diamonds with H colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $72,891 AUD to $247,423 AUD, with a median of $130,410 AUD. At least 10 retailers stock this exact specification, and 44% of the stones appear at more than one of them, with an average price spread of 30%. Half of all listings fall between $16,742 AUD and $23,012 AUD per carat. Over the last 30 days the median price moved +4.3% and the number of listings moved +0.8%.

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

100

Lowest Price

$42,637 AUD

Highest Price

$517,132 AUD

Average Price

$150,630 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

44.4%

Price Spread

30.2%

30-Day Price Trend

+4.3%

30-Day Supply Change

+0.8%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$14,589/ct

10th Percentile

$10,454

Median

$14,589

90th Percentile

$17,714

Score Distribution

266 diamonds scored across 4 quality tiers

Excellent

37 (13.9%)

Very Good

71 (26.7%)

Good

50 (18.8%)

Average

108 (40.6%)

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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