How much does a 0.50 to 0.74ct J SI1 lab grown oval diamond cost?

As of October 2026, 0.50 to 0.74ct J SI1 lab grown oval diamonds typically cost $441 NZD to $1,269 NZD, with a median price of $687 NZD. There are currently 7 diamonds matching this specification available across retailers.

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

About 38% of these diamonds are available at multiple retailers, with an average price spread of 92%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct J SI1 Lab Grown Oval

Quick answer

As of October 2026, there are 7 lab grown oval diamonds with J colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run $441 NZD to $1,269 NZD, with a median of $687 NZD. At least 15 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 92%. Half of all listings fall between $1,037 NZD and $2,349 NZD per carat. The same specification in natural form lists at a median of about $2,065 NZD per carat.

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

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Oval lab grown stones in the index: 453 USD per carat, -7.4% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: October 2026

Available

Lowest Price

$319 NZD

Highest Price

$3,346 NZD

Average Price

$783 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

38.5%

Price Spread

92.0%

Price Range

Price per carat distribution across retailers

$803/ct

10th Percentile

$422

Median

$803

90th Percentile

$2,161

Score Distribution

9 diamonds scored across 4 quality tiers

Excellent

1 (11.1%)

Very Good

3 (33.3%)

Good

3 (33.3%)

Average

2 (22.2%)

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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