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

As of September 2026, 3.00 to 4.99ct H SI1 lab grown cushion diamonds typically cost $1,108 NZD to $8,954 NZD, with a median price of $2,194 NZD. There are currently 115 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct H SI1 Lab Grown Cushion

Quick answer

As of September 2026, there are 115 lab grown cushion diamonds with H colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $1,108 NZD to $8,954 NZD, with a median of $2,194 NZD. At least 20 retailers stock this exact specification. Half of all listings fall between $599 NZD and $2,074 NZD per carat. The same specification in natural form lists at a median of about $22,477 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

115

Lowest Price

$665 NZD

Highest Price

$101,731 NZD

Average Price

$4,825 NZD

Market Intelligence

Retailers Selling

Price Spread

165.8%

Price Range

Price per carat distribution across retailers

$511/ct

10th Percentile

$260

Median

$511

90th Percentile

$1,917

Score Distribution

115 diamonds scored across 4 quality tiers

Excellent

11 (9.6%)

Very Good

38 (33.0%)

Good

32 (27.8%)

Average

34 (29.6%)

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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