How much does a 5.00ct+ G SI1 lab grown cushion diamond cost?

As of November 2026, 5.00ct+ G SI1 lab grown cushion diamonds typically cost $1,358 NZD to $9,754 NZD, with a median price of $4,130 NZD. There are currently 19 diamonds matching this specification available across retailers.

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

About 48% of these diamonds are available at multiple retailers, with an average price spread of 121%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ G SI1 Lab Grown Cushion

Quick answer

As of November 2026, there are 19 lab grown cushion diamonds with G colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $1,358 NZD to $9,754 NZD, with a median of $4,130 NZD. At least 17 retailers stock this exact specification, and 48% of the stones appear at more than one of them, with an average price spread of 121%. Half of all listings fall between $454 NZD and $1,223 NZD per carat. The same specification in natural form lists at a median of about $35,943 NZD per carat. Over the last 30 days the median price moved -6.3% and the number of listings moved +5.1%.

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: November 2026

Available

Lowest Price

$1,070 NZD

Highest Price

$63,767 NZD

Average Price

$6,792 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

47.8%

Price Spread

121.0%

30-Day Price Trend

-6.3%

30-Day Supply Change

+5.1%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$358/ct

10th Percentile

$214

Median

$358

90th Percentile

$886

Score Distribution

32 diamonds scored across 4 quality tiers

Excellent

11 (34.4%)

Very Good

1 (3.1%)

Good

14 (43.8%)

Average

6 (18.8%)

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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