How much does a 1.00 to 1.49ct I SI1 lab grown princess diamond cost?

As of September 2026, 1.00 to 1.49ct I SI1 lab grown princess diamonds typically cost $1,903 AUD to $2,749 AUD, with a median price of $1,973 AUD. There are currently 144 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct I SI1 Lab Grown Princess

Quick answer

As of September 2026, there are 144 lab grown princess diamonds with I colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,903 AUD to $2,749 AUD, with a median of $1,973 AUD. At least 14 retailers stock this exact specification. Half of all listings fall between $1,850 AUD and $2,071 AUD per carat. The same specification in natural form lists at a median of about $3,432 AUD per carat.

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

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Princess lab grown stones in the index: 481 USD per carat, -7.3% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

144

Lowest Price

$734 AUD

Highest Price

$6,901 AUD

Average Price

$2,355 AUD

Market Intelligence

Retailers Selling

Price Spread

11.8%

Price Range

Price per carat distribution across retailers

$1,335/ct

10th Percentile

$611

Median

$1,335

90th Percentile

$2,891

Score Distribution

144 diamonds scored across 4 quality tiers

Excellent

1 (0.7%)

Very Good

2 (1.4%)

Good

109 (75.7%)

Average

32 (22.2%)

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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