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 $1,887 AUD to $4,323 AUD, with a median price of $2,548 AUD. There are currently 172 diamonds matching this specification available across retailers.

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

About 10% 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 172 natural cushion diamonds with J colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,887 AUD to $4,323 AUD, with a median of $2,548 AUD. At least 15 retailers stock this exact specification, and 10% of the stones appear at more than one of them, with an average price spread of 26%. Half of all listings fall between $1,899 AUD and $2,433 AUD per carat. The same specification in lab grown form lists at a median of about $3,854 AUD per carat. Over the last 30 days the median price moved -1.7% and the number of listings moved -5.2%.

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

172

Lowest Price

$1,467 AUD

Highest Price

$6,680 AUD

Average Price

$3,019 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

9.5%

Price Spread

26.1%

30-Day Price Trend

-1.7%

30-Day Supply Change

-5.2%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,330/ct

10th Percentile

$1,133

Median

$1,330

90th Percentile

$2,239

Score Distribution

172 diamonds scored across 3 quality tiers

Very Good

11 (6.4%)

Good

15 (8.7%)

Average

146 (84.9%)

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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