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

As of October 2026, 3.00 to 4.99ct I SI2 lab grown oval diamonds typically cost $891 AUD to $69,333 AUD, with a median price of $33,597 AUD. There are currently 5 diamonds matching this specification available across retailers.

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

About 56% of these diamonds are available at multiple retailers, with an average price spread of 86%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct I SI2 Lab Grown Oval

Quick answer

As of October 2026, there are 5 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 $891 AUD to $69,333 AUD, with a median of $33,597 AUD. At least 19 retailers stock this exact specification, and 56% of the stones appear at more than one of them, with an average price spread of 86%. Half of all listings fall between $305 AUD and $783 AUD per carat. The same specification in natural form lists at a median of about $15,324 AUD per carat. Over the last 30 days the median price moved +5.9% and the number of listings moved +22.1%.

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

3.04ct Oval I SI2, IGI, grade A, from $729 AUD

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

$729 AUD

Highest Price

$77,821 AUD

Average Price

$31,201 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

55.6%

Price Spread

86.2%

30-Day Price Trend

+5.9%

30-Day Supply Change

+22.1%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$389/ct

10th Percentile

$169

Median

$389

90th Percentile

$696

Score Distribution

7 diamonds scored across 4 quality tiers

Excellent

1 (14.3%)

Very Good

1 (14.3%)

Good

1 (14.3%)

Average

4 (57.1%)

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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