How much does a 3.00 to 4.99ct J SI1 natural cushion diamond cost?

As of November 7, 2026, 3.00 to 4.99ct J SI1 natural cushion diamonds typically cost $28,776 NZD to $124,777 NZD, with a median price of $54,211 NZD. There are currently 219 diamonds matching this specification available across retailers.

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

About 39% of these diamonds are available at multiple retailers, with an average price spread of 55%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct J SI1 Natural Cushion

Quick answer

As of November 7, 2026, there are 219 natural cushion diamonds with J colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $28,776 NZD to $124,777 NZD, with a median of $54,211 NZD. Half of all listings fall between $12,099 NZD and $21,075 NZD per carat. The same specification in lab grown form lists at a median of about $9,280 NZD per carat. Over the last 30 days the median price moved -0.9% and the number of listings moved +6.8%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Cushion natural stones in the index: 2,881 USD per carat, -2.5% month on month. See the full index release

Figures come from current listings across more than 125 retailers. The index is a monthly release.

Last updated: November 7, 2026

Available

219

Lowest Price

$15,992 NZD

Highest Price

$203,143 NZD

Average Price

$66,143 NZD

Market Intelligence

Cross Retailer %

39.3%

Price Spread

54.9%

30-Day Price Trend

-0.9%

30-Day Supply Change

+6.8%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$9,068/ct

10th Percentile

$5,299

Median

$9,068

90th Percentile

$15,636

Score Distribution

219 diamonds scored across 4 quality tiers

Excellent

25 (11.4%)

Very Good

53 (24.2%)

Good

51 (23.3%)

Average

90 (41.1%)

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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