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

As of October 2026, 3.00 to 4.99ct J SI1 lab grown princess diamonds typically cost $6,335 USD to $6,335 USD, with a median price of $6,335 USD. There are currently 1 diamonds matching this specification available across retailers.

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

About 62% of these diamonds are available at multiple retailers, with an average price spread of 29%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct J SI1 Lab Grown Princess

Quick answer

As of October 2026, there are 1 lab grown princess diamonds with J color and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $6,335 USD to $6,335 USD, with a median of $6,335 USD. At least 12 retailers stock this exact specification, and 62% of the stones appear at more than one of them, with an average price spread of 29%. Half of all listings fall between $1,528 USD and $2,027 USD per carat. The same specification in natural form lists at a median of about $6,713 USD per carat. Over the last 30 days the median price moved -1.1% and the number of listings moved +15.2%.

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

$6,335 USD

Highest Price

$6,335 USD

Average Price

$6,335 USD

Market Intelligence

Retailers Selling

Cross Retailer %

61.5%

Price Spread

28.9%

30-Day Price Trend

-1.1%

30-Day Supply Change

+15.2%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,728/ct

10th Percentile

$1,380

Median

$1,728

90th Percentile

$2,368

Score Distribution

2 diamonds scored across 2 quality tiers

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