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

As of October 2026, 3.00 to 4.99ct J SI2 lab grown princess diamonds typically cost $8,885 USD to $45,005 USD, with a median price of $26,945 USD. There are currently 1 diamonds matching this specification available across retailers.

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

About 55% of these diamonds are available at multiple retailers, with an average price spread of 17%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct J SI2 Lab Grown Princess

Quick answer

As of October 2026, there are 1 lab grown princess diamonds with J color and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $8,885 USD to $45,005 USD, with a median of $26,945 USD. At least 9 retailers stock this exact specification, and 55% of the stones appear at more than one of them, with an average price spread of 17%. Half of all listings fall between $2,778 USD and $3,298 USD per carat. The same specification in natural form lists at a median of about $6,828 USD per carat. Over the last 30 days the median price moved -1.1% and the number of listings moved +15.2%.

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

4.40ct Princess J SI2, GIA, grade B+, from $49,520 USD

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

$4,370 USD

Highest Price

$51,170 USD

Average Price

$26,945 USD

Market Intelligence

Retailers Selling

Cross Retailer %

54.5%

Price Spread

16.6%

30-Day Price Trend

-1.1%

30-Day Supply Change

+15.2%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$3,141/ct

10th Percentile

$2,415

Median

$3,141

90th Percentile

$5,101

Score Distribution

2 diamonds scored across 2 quality tiers

Very Good

1 (50.0%)

Average

1 (50.0%)

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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