How much does a 1.00 to 1.49ct J SI2 natural cushion diamond cost?

As of September 2026, 1.00 to 1.49ct J SI2 natural cushion diamonds typically cost $1,643 AUD to $4,857 AUD, with a median price of $2,914 AUD. There are currently 611 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct J SI2 Natural Cushion

Quick answer

As of September 2026, there are 611 natural cushion diamonds with J colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,643 AUD to $4,857 AUD, with a median of $2,914 AUD. At least 44 retailers stock this exact specification. Half of all listings fall between $1,897 AUD and $3,629 AUD per carat. The same specification in lab grown form lists at a median of about $2,785 AUD per carat.

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

611

Lowest Price

$1,155 AUD

Highest Price

$10,585 AUD

Average Price

$3,160 AUD

Market Intelligence

Retailers Selling

Price Spread

68.0%

Price Range

Price per carat distribution across retailers

$1,656/ct

10th Percentile

$958

Median

$1,656

90th Percentile

$2,858

Score Distribution

611 diamonds scored across 4 quality tiers

Excellent

41 (6.7%)

Very Good

113 (18.5%)

Good

200 (32.7%)

Average

257 (42.1%)

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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