How much does a 0.50 to 0.74ct D SI1 lab grown cushion diamond cost?

As of October 2026, 0.50 to 0.74ct D SI1 lab grown cushion diamonds typically cost $271 AUD to $1,024 AUD, with a median price of $404 AUD. There are currently 45 diamonds matching this specification available across retailers.

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

About 48% of these diamonds are available at multiple retailers, with an average price spread of 95%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct D SI1 Lab Grown Cushion

Quick answer

As of October 2026, there are 45 lab grown cushion diamonds with D colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run $271 AUD to $1,024 AUD, with a median of $404 AUD. At least 33 retailers stock this exact specification, and 48% of the stones appear at more than one of them, with an average price spread of 95%. Half of all listings fall between $570 AUD and $1,311 AUD per carat. The same specification in natural form lists at a median of about $1,893 AUD per carat. Over the last 30 days the median price moved +1.1% and the number of listings moved +2.8%.

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

$178 AUD

Highest Price

$2,509 AUD

Average Price

$535 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

48.4%

Price Spread

94.7%

30-Day Price Trend

+1.1%

30-Day Supply Change

+2.8%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$550/ct

10th Percentile

$384

Median

$550

90th Percentile

$1,651

Score Distribution

83 diamonds scored across 4 quality tiers

Excellent

29 (34.9%)

Very Good

21 (25.3%)

Good

12 (14.5%)

Average

21 (25.3%)

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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