How much does a 5.00ct+ F SI1 natural cushion diamond cost?

As of November 2026, 5.00ct+ F SI1 natural cushion diamonds typically cost $139,697 NZD to $328,672 NZD, with a median price of $209,398 NZD. There are currently 21 diamonds matching this specification available across retailers.

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

About 33% of these diamonds are available at multiple retailers, with an average price spread of 36%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ F SI1 Natural Cushion

Quick answer

As of November 2026, there are 21 natural cushion diamonds with F colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $139,697 NZD to $328,672 NZD, with a median of $209,398 NZD. At least 41 retailers stock this exact specification, and 33% of the stones appear at more than one of them, with an average price spread of 36%. Half of all listings fall between $28,548 NZD and $41,257 NZD per carat. The same specification in lab grown form lists at a median of about $543 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

$98,922 NZD

Highest Price

$513,653 NZD

Average Price

$219,390 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

32.6%

Price Spread

36.3%

30-Day Price Trend

+0.2%

30-Day Supply Change

-2.1%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$19,729/ct

10th Percentile

$13,563

Median

$19,729

90th Percentile

$26,225

Score Distribution

48 diamonds scored across 4 quality tiers

Excellent

4 (8.3%)

Very Good

15 (31.3%)

Good

5 (10.4%)

Average

24 (50.0%)

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Consider Instead

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

F SI2SI2 inclusions are not visible without magnification

Save 22%

Lab-Grown F SI1Same specifications, lab-grown origin

Save 98%

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