How much does a 0.20 to 0.49ct E SI1 lab grown cushion diamond cost?

As of October 2026, 0.20 to 0.49ct E SI1 lab grown cushion diamonds typically cost $159 AUD to $644 AUD, with a median price of $349 AUD. There are currently 3 diamonds matching this specification available across retailers.

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

About 41% of these diamonds are available at multiple retailers, with an average price spread of 51%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct E SI1 Lab Grown Cushion

Quick answer

As of October 2026, there are 3 lab grown cushion diamonds with E colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $159 AUD to $644 AUD, with a median of $349 AUD. At least 23 retailers stock this exact specification, and 41% of the stones appear at more than one of them, with an average price spread of 51%. Half of all listings fall between $787 AUD and $1,256 AUD per carat. The same specification in natural form lists at a median of about $2,372 AUD per carat. Over the last 30 days the median price moved +0.5% and the number of listings moved -24.6%.

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

$146 AUD

Highest Price

$911 AUD

Average Price

$390 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

40.6%

Price Spread

50.5%

30-Day Price Trend

+0.5%

30-Day Supply Change

-24.6%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$652/ct

10th Percentile

$460

Median

$652

90th Percentile

$1,218

Score Distribution

7 diamonds scored across 4 quality tiers

Excellent

3 (42.9%)

Very Good

1 (14.3%)

Good

1 (14.3%)

Average

2 (28.6%)

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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