How much does a 5.00ct+ G SI2 natural cushion diamond cost?

As of November 2026, 5.00ct+ G SI2 natural cushion diamonds typically cost $99,517 NZD to $201,266 NZD, with a median price of $138,232 NZD. There are currently 17 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI2 cushion diamond?

About 29% of these diamonds are available at multiple retailers, with an average price spread of 31%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ G SI2 Natural Cushion

Quick answer

As of November 2026, there are 17 natural cushion diamonds with G colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $99,517 NZD to $201,266 NZD, with a median of $138,232 NZD. At least 29 retailers stock this exact specification, and 29% of the stones appear at more than one of them, with an average price spread of 31%. Half of all listings fall between $23,753 NZD and $32,214 NZD per carat. The same specification in lab grown form lists at a median of about $460 NZD per carat. Over the last 30 days the median price moved +0.2% and the number of listings moved -2.1%.

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 natural stones in the index: 2,948 USD per carat, +1.7% 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

$46,694 NZD

Highest Price

$544,315 NZD

Average Price

$154,032 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

28.9%

Price Spread

30.8%

30-Day Price Trend

+0.2%

30-Day Supply Change

-2.1%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$15,472/ct

10th Percentile

$11,194

Median

$15,472

90th Percentile

$21,214

Score Distribution

46 diamonds scored across 4 quality tiers

Excellent

11 (23.9%)

Very Good

9 (19.6%)

Good

11 (23.9%)

Average

15 (32.6%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

Lab-Grown G SI2Same specifications, lab-grown origin

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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