How much does a 5.00ct+ H SI1 natural round diamond cost?

As of September 2026, 5.00ct+ H SI1 natural round diamonds typically cost $110,627 NZD to $417,727 NZD, with a median price of $194,630 NZD. There are currently 163 diamonds matching this specification available across retailers.

Where can I find the best price on a H SI1 round diamond?

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5.00ct+ H SI1 Natural Round

Quick answer

As of September 2026, there are 163 natural round diamonds with H colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $110,627 NZD to $417,727 NZD, with a median of $194,630 NZD. At least 12 retailers stock this exact specification. Half of all listings fall between $29,899 NZD and $54,333 NZD per carat. The same specification in lab grown form lists at a median of about $1,979 NZD 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

163

Lowest Price

$61,257 NZD

Highest Price

$2,468,648 NZD

Average Price

$253,307 NZD

Market Intelligence

Retailers Selling

Price Spread

53.3%

Price Range

Price per carat distribution across retailers

$26,401/ct

10th Percentile

$12,055

Median

$26,401

90th Percentile

$32,608

Score Distribution

163 diamonds scored across 4 quality tiers

Excellent

26 (16.0%)

Very Good

39 (23.9%)

Good

43 (26.4%)

Average

55 (33.7%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

H SI2SI2 inclusions are not visible without magnification

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Lab-Grown H SI1Same specifications, lab-grown origin

Save 94%

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