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

As of October 2026, 1.00 to 1.49ct G SI2 lab grown cushion diamonds typically cost $1,231 AUD to $1,258 AUD, with a median price of $1,244 AUD. There are currently 1 diamonds matching this specification available across retailers.

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

About 17% of these diamonds are available at multiple retailers, with an average price spread of 82%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct G SI2 Lab Grown Cushion

Quick answer

As of October 2026, there are 1 lab grown cushion diamonds with G colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,231 AUD to $1,258 AUD, with a median of $1,244 AUD. At least 12 retailers stock this exact specification, and 17% of the stones appear at more than one of them, with an average price spread of 82%. Half of all listings fall between $500 AUD and $1,309 AUD per carat. The same specification in natural form lists at a median of about $3,697 AUD per carat. Over the last 30 days the median price moved +3.6% and the number of listings moved -6.3%.

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

1.04ct Cushion G SI2, IGI, grade C, from $1,262 AUD

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

$1,227 AUD

Highest Price

$1,262 AUD

Average Price

$1,244 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

16.7%

Price Spread

81.8%

30-Day Price Trend

+3.6%

30-Day Supply Change

-6.3%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$694/ct

10th Percentile

$301

Median

$694

90th Percentile

$978

Score Distribution

2 diamonds scored across 1 quality tiers

Average

2 (100.0%)

Find Your Diamond

Search 1 G SI2 cushion diamonds and compare prices.

Search Diamonds

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