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

As of October 2026, 0.75 to 0.99ct J SI1 lab grown round diamonds typically cost $1,344 AUD to $2,853 AUD, with a median price of $1,756 AUD. There are currently 2 diamonds matching this specification available across retailers.

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

About 14% of these diamonds are available at multiple retailers, with an average price spread of 39%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct J SI1 Lab Grown Round

Quick answer

As of October 2026, there are 2 lab grown round diamonds with J colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $1,344 AUD to $2,853 AUD, with a median of $1,756 AUD. At least 23 retailers stock this exact specification, and 14% of the stones appear at more than one of them, with an average price spread of 39%. Half of all listings fall between $1,315 AUD and $1,986 AUD per carat. The same specification in natural form lists at a median of about $2,224 AUD per carat. Over the last 30 days the median price moved -23.7% and the number of listings moved -76.8%.

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

0.90ct Round J SI1, IGI, grade B+, from $2,054 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. 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

Lowest Price

$1,322 AUD

Highest Price

$3,191 AUD

Average Price

$1,905 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

14.3%

Price Spread

38.5%

30-Day Price Trend

-23.7%

30-Day Supply Change

-76.8%

Volatility (30d)

0.19

Price Range

Price per carat distribution across retailers

$1,224/ct

10th Percentile

$445

Median

$1,224

90th Percentile

$1,721

Score Distribution

15 diamonds scored across 3 quality tiers

Very Good

2 (13.3%)

Good

5 (33.3%)

Average

8 (53.3%)

Find Your Diamond

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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