How much does a 1.50 to 1.99ct I SI1 lab grown princess diamond cost?

As of October 2026, 1.50 to 1.99ct I SI1 lab grown princess diamonds typically cost $1,665 SGD to $6,496 SGD, with a median price of $2,464 SGD. There are currently 18 diamonds matching this specification available across retailers.

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

About 28% of these diamonds are available at multiple retailers, with an average price spread of 90%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I SI1 Lab Grown Princess

Quick answer

As of October 2026, there are 18 lab grown princess diamonds with I colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $1,665 SGD to $6,496 SGD, with a median of $2,464 SGD. At least 29 retailers stock this exact specification, and 28% of the stones appear at more than one of them, with an average price spread of 90%. Half of all listings fall between $502 SGD and $1,526 SGD per carat. The same specification in natural form lists at a median of about $4,804 SGD per carat. Over the last 30 days the median price moved +23.6% and the number of listings moved -13.7%.

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

$687 SGD

Highest Price

$8,359 SGD

Average Price

$3,023 SGD

Market Intelligence

Retailers Selling

Cross Retailer %

28.3%

Price Spread

90.1%

30-Day Price Trend

+23.6%

30-Day Supply Change

-13.7%

Volatility (30d)

0.08

Price Range

Price per carat distribution across retailers

$886/ct

10th Percentile

$221

Median

$886

90th Percentile

$1,877

Score Distribution

26 diamonds scored across 3 quality tiers

Very Good

13 (50.0%)

Good

2 (7.7%)

Average

11 (42.3%)

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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