How much does a 1.00 to 1.49ct I SI2 lab grown princess diamond cost?

As of September 2026, 1.00 to 1.49ct I SI2 lab grown princess diamonds typically cost $970 USD to $3,587 USD, with a median price of $1,828 USD. There are currently 31 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

1.00 to 1.49ct I SI2 Lab Grown Princess

Quick answer

As of September 2026, there are 31 lab grown princess diamonds with I color and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $970 USD to $3,587 USD, with a median of $1,828 USD. At least 11 retailers stock this exact specification. Half of all listings fall between $1,469 USD and $2,103 USD per carat. The same specification in natural form lists at a median of about $2,176 USD per carat.

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

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

Lowest Price

$467 USD

Highest Price

$5,044 USD

Average Price

$2,084 USD

Market Intelligence

Retailers Selling

Price Spread

37.3%

Price Range

Price per carat distribution across retailers

$1,701/ct

10th Percentile

$1,032

Median

$1,701

90th Percentile

$2,933

Score Distribution

31 diamonds scored across 4 quality tiers

Excellent

2 (6.5%)

Very Good

3 (9.7%)

Good

1 (3.2%)

Average

25 (80.6%)

Find Your Diamond

Search 31 I SI2 princess diamonds and compare prices.

Search Diamonds

Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

I I1I1 inclusions are not visible without magnification

Save 20%

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