How much does a 1.00 to 1.49ct I I1 natural round diamond cost?

As of September 2026, 1.00 to 1.49ct I I1 natural round diamonds typically cost $2,043 NZD to $6,666 NZD, with a median price of $3,677 NZD. There are currently 1,126 diamonds matching this specification available across retailers.

Where can I find the best price on a I I1 round diamond?

About 53% of these diamonds are available at multiple retailers, with an average price spread of 52%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct I I1 Natural Round

Quick answer

As of September 2026, there are 1,126 natural round diamonds with I colour and I1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $2,043 NZD to $6,666 NZD, with a median of $3,677 NZD. At least 31 retailers stock this exact specification, and 53% of the stones appear at more than one of them, with an average price spread of 52%. Half of all listings fall between $2,666 NZD and $4,429 NZD per carat. The same specification in lab grown form lists at a median of about $3,377 NZD per carat. Over the last 30 days the median price moved -5.4% and the number of listings moved +10.2%.

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

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. Round natural stones in the index: 2,094 USD per carat, -3.8% 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

1,126

Lowest Price

$934 NZD

Highest Price

$18,536 NZD

Average Price

$4,074 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

53.0%

Price Spread

51.6%

30-Day Price Trend

-5.4%

30-Day Supply Change

+10.2%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$1,971/ct

10th Percentile

$1,175

Median

$1,971

90th Percentile

$3,217

Score Distribution

1.1K diamonds scored across 4 quality tiers

Excellent

93 (8.3%)

Very Good

341 (30.3%)

Good

317 (28.2%)

Average

375 (33.3%)

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Consider Instead

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

J I1J colour is visually identical to I to the naked eye

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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