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

As of October 2026, 3.00 to 4.99ct F SI1 natural cushion diamonds typically cost HK$223,759 HKD to HK$565,448 HKD, with a median price of HK$343,763 HKD. There are currently 109 diamonds matching this specification available across retailers.

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

About 40% 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.

3.00 to 4.99ct F SI1 Natural Cushion

Quick answer

As of October 2026, there are 109 natural cushion diamonds with F colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run HK$223,759 HKD to HK$565,448 HKD, with a median of HK$343,763 HKD. At least 54 retailers stock this exact specification, and 40% of the stones appear at more than one of them, with an average price spread of 30%. Half of all listings fall between HK$89,970 HKD and HK$121,233 HKD per carat. The same specification in lab grown form lists at a median of about HK$3,217 HKD per carat. Over the last 30 days the median price moved -0.3% and the number of listings moved +15.5%.

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: October 2026

Available

109

Lowest Price

HK$148,103 HKD

Highest Price

HK$1,025,180 HKD

Average Price

HK$377,256 HKD

Market Intelligence

Retailers Selling

Cross Retailer %

40.2%

Price Spread

29.6%

30-Day Price Trend

-0.3%

30-Day Supply Change

+15.5%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$13,451/ct

10th Percentile

$9,606

Median

$13,451

90th Percentile

$18,035

Score Distribution

220 diamonds scored across 4 quality tiers

Excellent

36 (16.4%)

Very Good

62 (28.2%)

Good

41 (18.6%)

Average

81 (36.8%)

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Consider Instead

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

F SI2SI2 inclusions are not visible without magnification

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Lab-Grown F 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