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

As of October 2026, 5.00ct+ I SI1 lab grown princess diamonds typically cost $1,098 AUD to $14,483 AUD, with a median price of $1,174 AUD. There are currently 2 diamonds matching this specification available across retailers.

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

About 67% of these diamonds are available at multiple retailers, with an average price spread of 510%. A comparison tool like Carat Hunter lets you see all the prices side by side.

5.00ct+ I SI1 Lab Grown Princess

Quick answer

As of October 2026, there are 2 lab grown princess diamonds with I colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $1,098 AUD to $14,483 AUD, with a median of $1,174 AUD. At least 12 retailers stock this exact specification, and 67% of the stones appear at more than one of them, with an average price spread of 510%. Half of all listings fall between $656 AUD and $5,106 AUD per carat. The same specification in natural form lists at a median of about $14,385 AUD per carat. Over the last 30 days the median price moved -29.2% and the number of listings moved +33.3%.

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

$1,079 AUD

Highest Price

$17,811 AUD

Average Price

$6,688 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

66.7%

Price Spread

510.2%

30-Day Price Trend

-29.2%

30-Day Supply Change

+33.3%

Volatility (30d)

0.16

Price Range

Price per carat distribution across retailers

$613/ct

10th Percentile

$221

Median

$613

90th Percentile

$3,899

Score Distribution

3 diamonds scored across 3 quality tiers

Excellent

1 (33.3%)

Very Good

1 (33.3%)

Good

1 (33.3%)

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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