How much does a 1.00 to 1.49ct J SI1 lab grown princess diamond cost?

As of September 2026, 1.00 to 1.49ct J SI1 lab grown princess diamonds typically cost $1,431 USD to $2,020 USD, with a median price of $1,500 USD. There are currently 243 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct J SI1 Lab Grown Princess

Quick answer

As of September 2026, there are 243 lab grown princess diamonds with J color and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,431 USD to $2,020 USD, with a median of $1,500 USD. At least 6 retailers stock this exact specification. Half of all listings fall between $1,378 USD and $1,391 USD per carat. The same specification in natural form lists at a median of about $1,873 USD per carat.

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

1.32ct Princess J SI1, IGI, score 84 of 100, from $668 USD

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

243

Lowest Price

$668 USD

Highest Price

$4,078 USD

Average Price

$1,680 USD

Market Intelligence

Retailers Selling

Price Spread

1.0%

Price Range

Price per carat distribution across retailers

$1,381/ct

10th Percentile

$1,368

Median

$1,381

90th Percentile

$1,553

Score Distribution

243 diamonds scored across 4 quality tiers

Excellent

1 (0.4%)

Very Good

4 (1.6%)

Good

186 (76.5%)

Average

52 (21.4%)

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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