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

As of September 2026, 3.00 to 4.99ct E SI1 lab grown cushion diamonds typically cost $1,067 NZD to $6,437 NZD, with a median price of $2,073 NZD. There are currently 273 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct E SI1 Lab Grown Cushion

Quick answer

As of September 2026, there are 273 lab grown cushion diamonds with E colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $1,067 NZD to $6,437 NZD, with a median of $2,073 NZD. At least 30 retailers stock this exact specification. Half of all listings fall between $447 NZD and $1,597 NZD per carat. The same specification in natural form lists at a median of about $30,295 NZD per carat.

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 lab grown stones in the index: 466 USD per carat, -14.7% 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

273

Lowest Price

$448 NZD

Highest Price

$65,811 NZD

Average Price

$3,420 NZD

Market Intelligence

Retailers Selling

Price Spread

171.4%

Price Range

Price per carat distribution across retailers

$386/ct

10th Percentile

$194

Median

$386

90th Percentile

$1,315

Score Distribution

273 diamonds scored across 4 quality tiers

Excellent

47 (17.2%)

Very Good

63 (23.1%)

Good

38 (13.9%)

Average

125 (45.8%)

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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