How much does a 3.00 to 4.99ct E SI1 lab grown cushion diamond cost?

As of October 2026, 3.00 to 4.99ct E SI1 lab grown cushion diamonds typically cost $498 USD to $3,140 USD, with a median price of $1,293 USD. There are currently 96 diamonds matching this specification available across retailers.

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

About 34% of these diamonds are available at multiple retailers, with an average price spread of 100%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct E SI1 Lab Grown Cushion

Quick answer

As of October 2026, there are 96 lab grown cushion diamonds with E color and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $498 USD to $3,140 USD, with a median of $1,293 USD. At least 36 retailers stock this exact specification, and 34% of the stones appear at more than one of them, with an average price spread of 100%. Half of all listings fall between $256 USD and $672 USD per carat. The same specification in natural form lists at a median of about $16,940 USD per carat. Over the last 30 days the median price moved +14.4% and the number of listings moved +2.2%.

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 lab grown stones in the index: 516 USD per carat, +6.9% 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

Lowest Price

$359 USD

Highest Price

$8,818 USD

Average Price

$1,620 USD

Market Intelligence

Retailers Selling

Cross Retailer %

34.1%

Price Spread

100.3%

30-Day Price Trend

+14.4%

30-Day Supply Change

+2.2%

Volatility (30d)

0.07

Price Range

Price per carat distribution across retailers

$415/ct

10th Percentile

$205

Median

$415

90th Percentile

$1,001

Score Distribution

242 diamonds scored across 4 quality tiers

Excellent

68 (28.1%)

Very Good

47 (19.4%)

Good

36 (14.9%)

Average

91 (37.6%)

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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