How much does a 1.50 to 1.99ct J SI1 lab grown princess diamond cost?

As of October 2026, 1.50 to 1.99ct J SI1 lab grown princess diamonds typically cost $1,793 AUD to $3,937 AUD, with a median price of $2,253 AUD. There are currently 20 diamonds matching this specification available across retailers.

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

About 58% of these diamonds are available at multiple retailers, with an average price spread of 65%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct J SI1 Lab Grown Princess

Quick answer

As of October 2026, there are 20 lab grown princess diamonds with J colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $1,793 AUD to $3,937 AUD, with a median of $2,253 AUD. At least 15 retailers stock this exact specification, and 58% of the stones appear at more than one of them, with an average price spread of 65%. Half of all listings fall between $1,144 AUD and $2,176 AUD per carat. The same specification in natural form lists at a median of about $3,606 AUD per carat. Over the last 30 days the median price moved +4.5% and the number of listings moved +9.0%.

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. Princess lab grown stones in the index: 461 USD per carat, -4.8% 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

$1,607 AUD

Highest Price

$10,533 AUD

Average Price

$2,864 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

57.7%

Price Spread

65.3%

30-Day Price Trend

+4.5%

30-Day Supply Change

+9.0%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,110/ct

10th Percentile

$701

Median

$1,110

90th Percentile

$2,083

Score Distribution

36 diamonds scored across 4 quality tiers

Excellent

15 (41.7%)

Very Good

3 (8.3%)

Good

8 (22.2%)

Average

10 (27.8%)

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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