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

As of September 2026, 1.00 to 1.49ct J SI2 lab grown cushion diamonds typically cost $2,500 AUD to $5,123 AUD, with a median price of $2,682 AUD. There are currently 29 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 Lab Grown Cushion

Quick answer

As of September 2026, there are 29 lab grown cushion diamonds with J colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,500 AUD to $5,123 AUD, with a median of $2,682 AUD. At least 4 retailers stock this exact specification. Half of all listings fall between $2,491 AUD and $3,765 AUD per carat. The same specification in natural form lists at a median of about $2,593 AUD per carat.

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 lab grown stones in the index: 466 USD per carat, -14.7% 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

Lowest Price

$1,365 AUD

Highest Price

$5,643 AUD

Average Price

$3,251 AUD

Market Intelligence

Retailers Selling

Price Spread

51.0%

Price Range

Price per carat distribution across retailers

$1,793/ct

10th Percentile

$1,776

Median

$1,793

90th Percentile

$3,243

Score Distribution

29 diamonds scored across 3 quality tiers

Very Good

1 (3.4%)

Good

1 (3.4%)

Average

27 (93.1%)

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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