How much does a 3.00 to 4.99ct I SI1 lab grown princess diamond cost?

As of September 2026, 3.00 to 4.99ct I SI1 lab grown princess diamonds typically cost $4,329 AUD to $11,145 AUD, with a median price of $7,561 AUD. There are currently 73 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

3.00 to 4.99ct I SI1 Lab Grown Princess

Quick answer

As of September 2026, there are 73 lab grown princess diamonds with I colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $4,329 AUD to $11,145 AUD, with a median of $7,561 AUD. At least 24 retailers stock this exact specification. Half of all listings fall between $433 AUD and $2,451 AUD per carat. The same specification in natural form lists at a median of about $15,053 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

Lowest Price

$659 AUD

Highest Price

$103,121 AUD

Average Price

$12,519 AUD

Market Intelligence

Retailers Selling

Price Spread

161.8%

Price Range

Price per carat distribution across retailers

$895/ct

10th Percentile

$203

Median

$895

90th Percentile

$2,776

Score Distribution

73 diamonds scored across 4 quality tiers

Excellent

2 (2.7%)

Very Good

5 (6.8%)

Good

16 (21.9%)

Average

50 (68.5%)

Find Your Diamond

Search 73 I 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