How much does a 3.00 to 4.99ct H SI1 natural cushion diamond cost?

As of November 2026, 3.00 to 4.99ct H SI1 natural cushion diamonds typically cost $38,508 AUD to $96,610 AUD, with a median price of $56,331 AUD. There are currently 140 diamonds matching this specification available across retailers.

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

About 43% of these diamonds are available at multiple retailers, with an average price spread of 33%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct H SI1 Natural Cushion

Quick answer

As of November 2026, there are 140 natural cushion diamonds with H colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $38,508 AUD to $96,610 AUD, with a median of $56,331 AUD. At least 56 retailers stock this exact specification, and 43% of the stones appear at more than one of them, with an average price spread of 33%. Half of all listings fall between $13,469 AUD and $18,884 AUD per carat. The same specification in lab grown form lists at a median of about $673 AUD per carat. Over the last 30 days the median price moved -0.7% and the number of listings moved +13.4%.

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. Cushion natural stones in the index: 2,948 USD per carat, +1.7% 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

140

Lowest Price

$18,740 AUD

Highest Price

$203,666 AUD

Average Price

$63,618 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

43.1%

Price Spread

33.2%

30-Day Price Trend

-0.7%

30-Day Supply Change

+13.4%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$11,469/ct

10th Percentile

$7,720

Median

$11,469

90th Percentile

$15,713

Score Distribution

310 diamonds scored across 4 quality tiers

Excellent

29 (9.4%)

Very Good

82 (26.5%)

Good

49 (15.8%)

Average

150 (48.4%)

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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

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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