How much does a 5.00ct+ I SI1 lab grown princess diamond cost?

As of September 2026, 5.00ct+ I SI1 lab grown princess diamonds typically cost $15,023 AUD to $21,450 AUD, with a median price of $18,028 AUD. There are currently 15 diamonds matching this specification available across retailers.

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

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5.00ct+ I SI1 Lab Grown Princess

Quick answer

As of September 2026, there are 15 lab grown princess diamonds with I colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $15,023 AUD to $21,450 AUD, with a median of $18,028 AUD. At least 11 retailers stock this exact specification. Half of all listings fall between $870 AUD and $5,363 AUD per carat. The same specification in natural form lists at a median of about $21,162 AUD per carat.

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

5.02ct Princess I SI1, IGI, score 68 of 100, from $18,622 AUD

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

$14,828 AUD

Highest Price

$23,717 AUD

Average Price

$17,800 AUD

Market Intelligence

Retailers Selling

Price Spread

150.3%

Price Range

Price per carat distribution across retailers

$1,943/ct

10th Percentile

$245

Median

$1,943

90th Percentile

$4,414

Score Distribution

15 diamonds scored across 1 quality tiers

Good

15 (100.0%)

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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