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 $2,365 NZD to $3,413 NZD, with a median price of $2,458 NZD. There are currently 324 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 324 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 $2,365 NZD to $3,413 NZD, with a median of $2,458 NZD. At least 5 retailers stock this exact specification. Half of all listings fall between $2,300 NZD and $2,320 NZD per carat. The same specification in natural form lists at a median of about $3,879 NZD per carat.

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

1.13ct Radiant J SI1, IGI, score 65 of 100, from $2,260 NZD

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

324

Lowest Price

$2,074 NZD

Highest Price

$11,345 NZD

Average Price

$2,801 NZD

Market Intelligence

Retailers Selling

Price Spread

0.9%

Price Range

Price per carat distribution across retailers

$1,389/ct

10th Percentile

$1,368

Median

$1,389

90th Percentile

$1,555

Score Distribution

324 diamonds scored across 3 quality tiers

Very Good

2 (0.6%)

Good

268 (82.7%)

Average

54 (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