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

As of September 2026, 1.00 to 1.49ct I SI1 lab grown princess diamonds typically cost HK$10,634 HKD to HK$15,362 HKD, with a median price of HK$11,026 HKD. There are currently 143 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct I SI1 Lab Grown Princess

Quick answer

As of September 2026, there are 143 lab grown princess diamonds with I colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run HK$10,634 HKD to HK$15,362 HKD, with a median of HK$11,026 HKD. At least 14 retailers stock this exact specification. Half of all listings fall between HK$10,337 HKD and HK$11,575 HKD per carat. The same specification in natural form lists at a median of about HK$19,149 HKD 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

143

Lowest Price

HK$4,101 HKD

Highest Price

HK$38,563 HKD

Average Price

HK$13,174 HKD

Market Intelligence

Retailers Selling

Price Spread

11.8%

Price Range

Price per carat distribution across retailers

$1,335/ct

10th Percentile

$691

Median

$1,335

90th Percentile

$2,655

Score Distribution

143 diamonds scored across 4 quality tiers

Excellent

1 (0.7%)

Very Good

3 (2.1%)

Good

107 (74.8%)

Average

32 (22.4%)

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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