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

As of October 2026, 1.50 to 1.99ct G SI1 lab grown princess diamonds typically cost $327 AUD to $2,080 AUD, with a median price of $889 AUD. There are currently 48 diamonds matching this specification available across retailers.

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

About 37% of these diamonds are available at multiple retailers, with an average price spread of 103%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct G SI1 Lab Grown Princess

Quick answer

As of October 2026, there are 48 lab grown princess diamonds with G colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $327 AUD to $2,080 AUD, with a median of $889 AUD. At least 35 retailers stock this exact specification, and 37% of the stones appear at more than one of them, with an average price spread of 103%. Half of all listings fall between $317 AUD and $844 AUD per carat. The same specification in natural form lists at a median of about $7,200 AUD per carat. Over the last 30 days the median price moved +2.9% and the number of listings moved +11.2%.

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

$275 AUD

Highest Price

$5,134 AUD

Average Price

$1,143 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

36.6%

Price Spread

102.8%

30-Day Price Trend

+2.9%

30-Day Supply Change

+11.2%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$360/ct

10th Percentile

$146

Median

$360

90th Percentile

$865

Score Distribution

102 diamonds scored across 4 quality tiers

Excellent

14 (13.7%)

Very Good

19 (18.6%)

Good

21 (20.6%)

Average

48 (47.1%)

Find Your Diamond

Search 48 G SI1 princess diamonds and compare prices.

Search Diamonds

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