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 HK$211,730 HKD to HK$529,243 HKD, with a median price of HK$309,748 HKD. 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 44% 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 HK$211,730 HKD to HK$529,243 HKD, with a median of HK$309,748 HKD. At least 56 retailers stock this exact specification, and 44% of the stones appear at more than one of them, with an average price spread of 33%. Half of all listings fall between HK$74,298 HKD and HK$103,990 HKD per carat. The same specification in lab grown form lists at a median of about HK$3,686 HKD per carat. Over the last 30 days the median price moved -0.7% and the number of listings moved +14.2%.

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

140

Lowest Price

HK$103,281 HKD

Highest Price

HK$1,122,439 HKD

Average Price

HK$349,683 HKD

Market Intelligence

Retailers Selling

Cross Retailer %

43.6%

Price Spread

33.0%

30-Day Price Trend

-0.7%

30-Day Supply Change

+14.2%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$11,471/ct

10th Percentile

$7,719

Median

$11,471

90th Percentile

$15,703

Score Distribution

309 diamonds scored across 4 quality tiers

Excellent

29 (9.4%)

Very Good

82 (26.5%)

Good

49 (15.9%)

Average

149 (48.2%)

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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