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

As of October 2026, 3.00 to 4.99ct D SI1 natural cushion diamonds typically cost $31,188 USD to $84,301 USD, with a median price of $47,648 USD. There are currently 104 diamonds matching this specification available across retailers.

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

About 38% of these diamonds are available at multiple retailers, with an average price spread of 34%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct D SI1 Natural Cushion

Quick answer

As of October 2026, there are 104 natural cushion diamonds with D color and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $31,188 USD to $84,301 USD, with a median of $47,648 USD. At least 54 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 34%. Half of all listings fall between $12,543 USD and $17,721 USD per carat. The same specification in lab grown form lists at a median of about $397 USD per carat. Over the last 30 days the median price moved -1.3% and the number of listings moved +10.2%.

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

104

Lowest Price

$21,480 USD

Highest Price

$168,777 USD

Average Price

$51,969 USD

Market Intelligence

Retailers Selling

Cross Retailer %

37.9%

Price Spread

34.1%

30-Day Price Trend

-1.3%

30-Day Supply Change

+10.2%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$15,174/ct

10th Percentile

$10,643

Median

$15,174

90th Percentile

$20,347

Score Distribution

223 diamonds scored across 4 quality tiers

Excellent

48 (21.5%)

Very Good

51 (22.9%)

Good

51 (22.9%)

Average

73 (32.7%)

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Consider Instead

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

D SI2SI2 inclusions are not visible without magnification

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Lab-Grown D 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