How much does a 3.00 to 4.99ct I I1 natural cushion diamond cost?

As of September 2026, 3.00 to 4.99ct I I1 natural cushion diamonds typically cost $12,008 USD to $89,422 USD, with a median price of $26,150 USD. There are currently 13 diamonds matching this specification available across retailers.

Where can I find the best price on a I I1 cushion diamond?

About 58% of these diamonds are available at multiple retailers, with an average price spread of 41%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct I I1 Natural Cushion

Quick answer

As of September 2026, there are 13 natural cushion diamonds with I color and I1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $12,008 USD to $89,422 USD, with a median of $26,150 USD. At least 10 retailers stock this exact specification, and 58% of the stones appear at more than one of them, with an average price spread of 41%. Half of all listings fall between $4,769 USD and $6,980 USD per carat. Over the last 30 days the median price moved -16.1% and the number of listings moved -82.8%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Cushion natural stones in the index: 2,792 USD per carat, +1.1% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

Lowest Price

$10,677 USD

Highest Price

$117,243 USD

Average Price

$36,354 USD

Market Intelligence

Retailers Selling

Cross Retailer %

58.3%

Price Spread

40.6%

30-Day Price Trend

-16.1%

30-Day Supply Change

-82.8%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$5,451/ct

10th Percentile

$2,801

Median

$5,451

90th Percentile

$7,506

Score Distribution

13 diamonds scored across 4 quality tiers

Excellent

1 (7.7%)

Very Good

5 (38.5%)

Good

1 (7.7%)

Average

6 (46.2%)

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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