How much does a 1.00 to 1.49ct J SI1 lab grown radiant diamond cost?

As of September 2026, 1.00 to 1.49ct J SI1 lab grown radiant diamonds typically cost $1,978 AUD to $2,855 AUD, with a median price of $2,056 AUD. There are currently 312 diamonds matching this specification available across retailers.

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

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

1.00 to 1.49ct J SI1 Lab Grown Radiant

Quick answer

As of September 2026, there are 312 lab grown radiant diamonds with J colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,978 AUD to $2,855 AUD, with a median of $2,056 AUD. At least 5 retailers stock this exact specification. Half of all listings fall between $1,924 AUD and $1,941 AUD per carat. The same specification in natural form lists at a median of about $3,274 AUD per carat.

Three of the best scored stones at this specification right now:

1.13ct Radiant J SI1, IGI, score 65 of 100, from $1,891 AUD

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

312

Lowest Price

$1,735 AUD

Highest Price

$9,490 AUD

Average Price

$2,344 AUD

Market Intelligence

Retailers Selling

Price Spread

0.9%

Price Range

Price per carat distribution across retailers

$1,389/ct

10th Percentile

$1,369

Median

$1,389

90th Percentile

$1,547

Score Distribution

312 diamonds scored across 3 quality tiers

Very Good

2 (0.6%)

Good

258 (82.7%)

Average

52 (16.7%)

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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