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

As of September 2026, 1.00 to 1.49ct I SI2 lab grown radiant diamonds typically cost $2,308 SGD to $4,021 SGD, with a median price of $2,345 SGD. There are currently 34 diamonds matching this specification available across retailers.

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

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

1.00 to 1.49ct I SI2 Lab Grown Radiant

Quick answer

As of September 2026, there are 34 lab grown radiant diamonds with I colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,308 SGD to $4,021 SGD, with a median of $2,345 SGD. At least 6 retailers stock this exact specification. Half of all listings fall between $2,252 SGD and $2,285 SGD per carat. The same specification in natural form lists at a median of about $3,458 SGD per carat.

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. Radiant lab grown stones in the index: 473 USD per carat, -12.5% 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

$1,207 SGD

Highest Price

$6,468 SGD

Average Price

$2,745 SGD

Market Intelligence

Retailers Selling

Price Spread

1.5%

Price Range

Price per carat distribution across retailers

$1,708/ct

10th Percentile

$1,486

Median

$1,708

90th Percentile

$3,353

Score Distribution

34 diamonds scored across 2 quality tiers

Good

3 (8.8%)

Average

31 (91.2%)

Find Your Diamond

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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