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

As of September 2026, 3.00 to 4.99ct I SI1 lab grown princess diamonds typically cost $3,951 SGD to $10,172 SGD, with a median price of $6,901 SGD. There are currently 73 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct I SI1 Lab Grown Princess

Quick answer

As of September 2026, there are 73 lab grown princess diamonds with I colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $3,951 SGD to $10,172 SGD, with a median of $6,901 SGD. At least 24 retailers stock this exact specification. Half of all listings fall between $395 SGD and $2,237 SGD per carat. The same specification in natural form lists at a median of about $13,750 SGD 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

$141 SGD

Highest Price

$94,120 SGD

Average Price

$11,415 SGD

Market Intelligence

Retailers Selling

Price Spread

161.8%

Price Range

Price per carat distribution across retailers

$895/ct

10th Percentile

$205

Median

$895

90th Percentile

$2,776

Score Distribution

73 diamonds scored across 4 quality tiers

Excellent

3 (4.1%)

Very Good

4 (5.5%)

Good

16 (21.9%)

Average

50 (68.5%)

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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