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

As of September 2026, 1.00 to 1.49ct J SI2 lab grown oval diamonds typically cost $3,139 NZD to $4,499 NZD, with a median price of $3,295 NZD. There are currently 115 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct J SI2 Lab Grown Oval

Quick answer

As of September 2026, there are 115 lab grown oval diamonds with J colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $3,139 NZD to $4,499 NZD, with a median of $3,295 NZD. At least 19 retailers stock this exact specification. Half of all listings fall between $3,039 NZD and $3,108 NZD per carat. The same specification in natural form lists at a median of about $3,453 NZD 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. Oval lab grown stones in the index: 487 USD per carat, -11.2% 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

115

Lowest Price

$453 NZD

Highest Price

$9,251 NZD

Average Price

$3,595 NZD

Market Intelligence

Retailers Selling

Price Spread

2.2%

Price Range

Price per carat distribution across retailers

$1,780/ct

10th Percentile

$1,102

Median

$1,780

90th Percentile

$2,430

Score Distribution

115 diamonds scored across 3 quality tiers

Very Good

4 (3.5%)

Good

2 (1.7%)

Average

109 (94.8%)

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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