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

As of November 2026, 5.00ct+ H SI1 natural cushion diamonds typically cost $99,558 NZD to $264,338 NZD, with a median price of $177,215 NZD. There are currently 31 diamonds matching this specification available across retailers.

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

About 25% of these diamonds are available at multiple retailers, with an average price spread of 45%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ H SI1 Natural Cushion

Quick answer

As of November 2026, there are 31 natural cushion diamonds with H colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $99,558 NZD to $264,338 NZD, with a median of $177,215 NZD. At least 43 retailers stock this exact specification, and 25% of the stones appear at more than one of them, with an average price spread of 45%. Half of all listings fall between $22,488 NZD and $34,923 NZD per carat. The same specification in lab grown form lists at a median of about $3,214 NZD per carat. Over the last 30 days the median price moved -2.5% and the number of listings moved -1.1%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Cushion natural stones in the index: 2,881 USD per carat, -2.5% 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: November 2026

Available

Lowest Price

$61,905 NZD

Highest Price

$932,590 NZD

Average Price

$196,666 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

25.4%

Price Spread

45.3%

30-Day Price Trend

-2.5%

30-Day Supply Change

-1.1%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$15,486/ct

10th Percentile

$10,196

Median

$15,486

90th Percentile

$22,257

Score Distribution

89 diamonds scored across 4 quality tiers

Excellent

4 (4.5%)

Very Good

18 (20.2%)

Good

15 (16.9%)

Average

52 (58.4%)

Find Your Diamond

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Consider Instead

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

Lab-Grown H SI1Same specifications, lab-grown origin

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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