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

As of October 2026, 3.00 to 4.99ct I SI2 natural oval diamonds typically cost $24,705 AUD to $75,670 AUD, with a median price of $46,151 AUD. There are currently 270 diamonds matching this specification available across retailers.

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

About 34% of these diamonds are available at multiple retailers, with an average price spread of 49%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct I SI2 Natural Oval

Quick answer

As of October 2026, there are 270 natural oval diamonds with I colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $24,705 AUD to $75,670 AUD, with a median of $46,151 AUD. At least 53 retailers stock this exact specification, and 34% of the stones appear at more than one of them, with an average price spread of 49%. Half of all listings fall between $9,758 AUD and $16,286 AUD per carat. The same specification in lab grown form lists at a median of about $538 AUD per carat. Over the last 30 days the median price moved +0.1% and the number of listings moved +4.4%.

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 natural stones in the index: 2,655 USD per carat, +10.2% 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

270

Lowest Price

$12,109 AUD

Highest Price

$195,154 AUD

Average Price

$50,316 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

34.1%

Price Spread

49.1%

30-Day Price Trend

+0.1%

30-Day Supply Change

+4.4%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$9,341/ct

10th Percentile

$5,313

Median

$9,341

90th Percentile

$13,328

Score Distribution

797 diamonds scored across 4 quality tiers

Excellent

161 (20.2%)

Very Good

182 (22.8%)

Good

163 (20.5%)

Average

291 (36.5%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

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

Save 30%

Lab-Grown I SI2Same specifications, lab-grown origin

Save 96%

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