How much does a 1.00 to 1.49ct J SI1 lab grown cushion diamond cost?

As of October 2026, 1.00 to 1.49ct J SI1 lab grown cushion diamonds typically cost $1,374 AUD to $1,526 AUD, with a median price of $1,404 AUD. There are currently 2 diamonds matching this specification available across retailers.

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

About 44% of these diamonds are available at multiple retailers, with an average price spread of 45%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J SI1 Lab Grown Cushion

Quick answer

As of October 2026, there are 2 lab grown cushion diamonds with J colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,374 AUD to $1,526 AUD, with a median of $1,404 AUD. At least 10 retailers stock this exact specification, and 44% of the stones appear at more than one of them, with an average price spread of 45%. Half of all listings fall between $1,093 AUD and $1,708 AUD per carat. The same specification in natural form lists at a median of about $2,853 AUD per carat.

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

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Cushion lab grown stones in the index: 516 USD per carat, +6.9% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: October 2026

Available

Lowest Price

$1,366 AUD

Highest Price

$2,674 AUD

Average Price

$1,442 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

44.4%

Price Spread

45.5%

Price Range

Price per carat distribution across retailers

$950/ct

10th Percentile

$613

Median

$950

90th Percentile

$1,705

Score Distribution

3 diamonds scored across 2 quality tiers

Excellent

1 (33.3%)

Very Good

2 (66.7%)

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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