How much does a 3.00 to 4.99ct I SI2 lab grown oval diamond cost?

As of September 2026, 3.00 to 4.99ct I SI2 lab grown oval diamonds typically cost $9,801 AUD to $91,989 AUD, with a median price of $64,592 AUD. There are currently 22 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct I SI2 Lab Grown Oval

Quick answer

As of September 2026, there are 22 lab grown oval diamonds with I colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $9,801 AUD to $91,989 AUD, with a median of $64,592 AUD. At least 14 retailers stock this exact specification. Half of all listings fall between $10,340 AUD and $19,625 AUD per carat. The same specification in natural form lists at a median of about $15,036 AUD per carat.

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

$9,538 AUD

Highest Price

$127,396 AUD

Average Price

$59,072 AUD

Market Intelligence

Retailers Selling

Price Spread

52.1%

Price Range

Price per carat distribution across retailers

$12,698/ct

10th Percentile

$2,251

Median

$12,698

90th Percentile

$15,335

Score Distribution

22 diamonds scored across 2 quality tiers

Good

2 (9.1%)

Average

20 (90.9%)

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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