How much does a 5.00ct+ J SI2 lab grown oval diamond cost?

As of September 2026, 5.00ct+ J SI2 lab grown oval diamonds typically cost $94,406 AUD to $229,914 AUD, with a median price of $142,965 AUD. There are currently 9 diamonds matching this specification available across retailers.

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

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

5.00ct+ J SI2 Lab Grown Oval

Quick answer

As of September 2026, there are 9 lab grown oval diamonds with J colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $94,406 AUD to $229,914 AUD, with a median of $142,965 AUD. At least 4 retailers stock this exact specification. Half of all listings fall between $14,765 AUD and $14,765 AUD per carat. The same specification in natural form lists at a median of about $21,242 AUD per carat.

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

8.01ct Oval J SI2, certified, score 72 of 100, from $106,640 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. 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

Lowest Price

$66,986 AUD

Highest Price

$238,481 AUD

Average Price

$152,529 AUD

Market Intelligence

Retailers Selling

Price Spread

0.0%

Price Range

Price per carat distribution across retailers

$10,527/ct

10th Percentile

$10,466

Median

$10,527

90th Percentile

$12,787

Score Distribution

9 diamonds scored across 3 quality tiers

Very Good

1 (11.1%)

Good

2 (22.2%)

Average

6 (66.7%)

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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