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

As of September 2026, 5.00ct+ I SI2 lab grown oval diamonds typically cost $49,574 AUD to $222,090 AUD, with a median price of $108,071 AUD. There are currently 8 diamonds matching this specification available across retailers.

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

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5.00ct+ I SI2 Lab Grown Oval

Quick answer

As of September 2026, there are 8 lab grown oval diamonds with I colour and SI2 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $49,574 AUD to $222,090 AUD, with a median of $108,071 AUD. At least 10 retailers stock this exact specification. Half of all listings fall between $8,661 AUD and $24,244 AUD per carat. The same specification in natural form lists at a median of about $27,301 AUD 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

Lowest Price

$48,642 AUD

Highest Price

$247,383 AUD

Average Price

$122,107 AUD

Market Intelligence

Retailers Selling

Price Spread

72.7%

Price Range

Price per carat distribution across retailers

$15,374/ct

10th Percentile

$1,156

Median

$15,374

90th Percentile

$24,980

Score Distribution

8 diamonds scored across 3 quality tiers

Very Good

1 (12.5%)

Good

2 (25.0%)

Average

5 (62.5%)

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J SI2J colour is visually identical to I to the naked eye

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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