How much does a 3.00 to 4.99ct I SI2 lab grown princess diamond cost?

As of October 2026, 3.00 to 4.99ct I SI2 lab grown princess diamonds typically cost $515 USD to $33,358 USD, with a median price of $866 USD. There are currently 7 diamonds matching this specification available across retailers.

Where can I find the best price on a I SI2 princess diamond?

About 42% of these diamonds are available at multiple retailers, with an average price spread of 289%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct I SI2 Lab Grown Princess

Quick answer

As of October 2026, there are 7 lab grown princess diamonds with I color and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $515 USD to $33,358 USD, with a median of $866 USD. At least 19 retailers stock this exact specification, and 42% of the stones appear at more than one of them, with an average price spread of 289%. Half of all listings fall between $323 USD and $2,301 USD per carat. The same specification in natural form lists at a median of about $8,119 USD per carat. Over the last 30 days the median price moved +7.7% and the number of listings moved -2.6%.

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

$331 USD

Highest Price

$56,040 USD

Average Price

$11,653 USD

Market Intelligence

Retailers Selling

Cross Retailer %

41.7%

Price Spread

289.5%

30-Day Price Trend

+7.7%

30-Day Supply Change

-2.6%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$683/ct

10th Percentile

$244

Median

$683

90th Percentile

$2,931

Score Distribution

9 diamonds scored across 3 quality tiers

Very Good

2 (22.2%)

Good

2 (22.2%)

Average

5 (55.6%)

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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