How much does a 3.00 to 4.99ct K SI2 natural cushion diamond cost?

As of November 6, 2026, 3.00 to 4.99ct K SI2 natural cushion diamonds typically cost $14,822 SGD to $43,081 SGD, with a median price of $23,200 SGD. There are currently 119 diamonds matching this specification available across retailers.

Where can I find the best price on a K SI2 cushion diamond?

About 45% of these diamonds are available at multiple retailers, with an average price spread of 48%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct K SI2 Natural Cushion

Quick answer

As of November 6, 2026, there are 119 natural cushion diamonds with K colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $14,822 SGD to $43,081 SGD, with a median of $23,200 SGD. Half of all listings fall between $5,623 SGD and $9,259 SGD per carat. Over the last 30 days the median price moved -1.1% and the number of listings moved +7.7%.

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 125 retailers. The index is a monthly release.

Last updated: November 6, 2026

Available

119

Lowest Price

$10,153 SGD

Highest Price

$89,548 SGD

Average Price

$26,800 SGD

Market Intelligence

Cross Retailer %

45.4%

Price Spread

47.7%

30-Day Price Trend

-1.1%

30-Day Supply Change

+7.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$5,947/ct

10th Percentile

$3,841

Median

$5,947

90th Percentile

$8,699

Score Distribution

119 diamonds scored across 4 quality tiers

Excellent

28 (23.5%)

Very Good

31 (26.1%)

Good

37 (31.1%)

Average

23 (19.3%)

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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