How much does a 1.00 to 1.49ct J I1 natural cushion diamond cost?

As of September 2026, 1.00 to 1.49ct J I1 natural cushion diamonds typically cost $2,149 NZD to $4,944 NZD, with a median price of $2,910 NZD. There are currently 173 diamonds matching this specification available across retailers.

Where can I find the best price on a J I1 cushion diamond?

About 9% of these diamonds are available at multiple retailers, with an average price spread of 26%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J I1 Natural Cushion

Quick answer

As of September 2026, there are 173 natural cushion diamonds with J colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,149 NZD to $4,944 NZD, with a median of $2,910 NZD. At least 15 retailers stock this exact specification, and 9% of the stones appear at more than one of them, with an average price spread of 26%. Half of all listings fall between $2,160 NZD and $2,773 NZD per carat. The same specification in lab grown form lists at a median of about $4,387 NZD per carat. Over the last 30 days the median price moved -1.7% and the number of listings moved -4.4%.

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 natural stones in the index: 2,792 USD per carat, +1.1% 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

173

Lowest Price

$1,668 NZD

Highest Price

$7,603 NZD

Average Price

$3,442 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

9.4%

Price Spread

26.3%

30-Day Price Trend

-1.7%

30-Day Supply Change

-4.4%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,330/ct

10th Percentile

$1,122

Median

$1,330

90th Percentile

$2,251

Score Distribution

173 diamonds scored across 3 quality tiers

Very Good

10 (5.8%)

Good

15 (8.7%)

Average

148 (85.5%)

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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