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

As of September 2026, 1.00 to 1.49ct J SI2 lab grown radiant diamonds typically cost $2,485 CAD to $3,504 CAD, with a median price of $2,619 CAD. There are currently 78 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct J SI2 Lab Grown Radiant

Quick answer

As of September 2026, there are 78 lab grown radiant diamonds with J color and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,485 CAD to $3,504 CAD, with a median of $2,619 CAD. At least 6 retailers stock this exact specification. Half of all listings fall between $1,627 CAD and $3,594 CAD per carat. The same specification in natural form lists at a median of about $3,081 CAD 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. 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

$866 CAD

Highest Price

$5,689 CAD

Average Price

$2,829 CAD

Market Intelligence

Retailers Selling

Price Spread

66.1%

Price Range

Price per carat distribution across retailers

$2,147/ct

10th Percentile

$690

Median

$2,147

90th Percentile

$2,992

Score Distribution

78 diamonds scored across 3 quality tiers

Excellent

1 (1.3%)

Good

8 (10.3%)

Average

69 (88.5%)

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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