How much does a 0.50 to 0.74ct I SI2 natural oval diamond cost?

As of October 2026, 0.50 to 0.74ct I SI2 natural oval diamonds typically cost $724 NZD to $2,058 NZD, with a median price of $1,173 NZD. There are currently 261 diamonds matching this specification available across retailers.

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

About 27% of these diamonds are available at multiple retailers, with an average price spread of 47%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct I SI2 Natural Oval

Quick answer

As of October 2026, there are 261 natural oval diamonds with I colour and SI2 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run $724 NZD to $2,058 NZD, with a median of $1,173 NZD. At least 53 retailers stock this exact specification, and 27% of the stones appear at more than one of them, with an average price spread of 47%. Half of all listings fall between $1,788 NZD and $2,810 NZD per carat. The same specification in lab grown form lists at a median of about $1,292 NZD per carat. Over the last 30 days the median price moved -1.3% and the number of listings moved +4.6%.

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

261

Lowest Price

$419 NZD

Highest Price

$4,601 NZD

Average Price

$1,332 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

27.2%

Price Spread

47.1%

30-Day Price Trend

-1.3%

30-Day Supply Change

+4.6%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,219/ct

10th Percentile

$855

Median

$1,219

90th Percentile

$2,251

Score Distribution

683 diamonds scored across 4 quality tiers

Excellent

71 (10.4%)

Very Good

210 (30.7%)

Good

210 (30.7%)

Average

192 (28.1%)

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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 8%

Lab-Grown I SI2Same specifications, lab-grown origin

Save 40%

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