How much does a 0.75 to 0.99ct D SI1 lab grown round diamond cost?

As of October 2026, 0.75 to 0.99ct D SI1 lab grown round diamonds typically cost $221 AUD to $1,680 AUD, with a median price of $694 AUD. There are currently 175 diamonds matching this specification available across retailers.

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

About 27% of these diamonds are available at multiple retailers, with an average price spread of 76%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct D SI1 Lab Grown Round

Quick answer

As of October 2026, there are 175 lab grown round diamonds with D colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $221 AUD to $1,680 AUD, with a median of $694 AUD. At least 32 retailers stock this exact specification, and 27% of the stones appear at more than one of them, with an average price spread of 76%. Half of all listings fall between $409 AUD and $868 AUD per carat. The same specification in natural form lists at a median of about $3,860 AUD per carat. Over the last 30 days the median price moved -0.8% and the number of listings moved -1.0%.

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. Round lab grown stones in the index: 414 USD per carat, -5.0% 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

175

Lowest Price

$159 AUD

Highest Price

$2,272 AUD

Average Price

$750 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

26.6%

Price Spread

76.3%

30-Day Price Trend

-0.8%

30-Day Supply Change

-1.0%

Volatility (30d)

0.03

Price Range

Price per carat distribution across retailers

$423/ct

10th Percentile

$184

Median

$423

90th Percentile

$1,089

Score Distribution

424 diamonds scored across 4 quality tiers

Excellent

112 (26.4%)

Very Good

59 (13.9%)

Good

109 (25.7%)

Average

144 (34.0%)

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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