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 $31,210 NZD to $94,654 NZD, with a median price of $57,729 NZD. There are currently 238 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 238 natural oval diamonds with I colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run $31,210 NZD to $94,654 NZD, with a median of $57,729 NZD. 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 $12,206 NZD and $20,397 NZD per carat. The same specification in lab grown form lists at a median of about $693 NZD per carat. Over the last 30 days the median price moved +0.4% and the number of listings moved +0.7%.

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

238

Lowest Price

$15,147 NZD

Highest Price

$244,114 NZD

Average Price

$63,025 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

33.7%

Price Spread

49.1%

30-Day Price Trend

+0.4%

30-Day Supply Change

+0.7%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$9,363/ct

10th Percentile

$5,307

Median

$9,363

90th Percentile

$13,322

Score Distribution

671 diamonds scored across 4 quality tiers

Excellent

141 (21.0%)

Very Good

138 (20.6%)

Good

120 (17.9%)

Average

272 (40.5%)

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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 29%

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