How much does a 1.50 to 1.99ct D I1 natural round diamond cost?

As of October 2026, 1.50 to 1.99ct D I1 natural round diamonds typically cost $7,695 NZD to $28,536 NZD, with a median price of $15,405 NZD. There are currently 100 diamonds matching this specification available across retailers.

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

About 21% of these diamonds are available at multiple retailers, with an average price spread of 71%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct D I1 Natural Round

Quick answer

As of October 2026, there are 100 natural round diamonds with D colour and I1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $7,695 NZD to $28,536 NZD, with a median of $15,405 NZD. At least 27 retailers stock this exact specification, and 21% of the stones appear at more than one of them, with an average price spread of 71%. Half of all listings fall between $5,364 NZD and $10,564 NZD per carat. The same specification in lab grown form lists at a median of about $510 NZD per carat. Over the last 30 days the median price moved -4.0% and the number of listings moved +8.1%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

100

Lowest Price

$2,880 NZD

Highest Price

$38,493 NZD

Average Price

$16,592 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

21.4%

Price Spread

70.7%

30-Day Price Trend

-4.0%

30-Day Supply Change

+8.1%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$4,132/ct

10th Percentile

$2,229

Median

$4,132

90th Percentile

$7,376

Score Distribution

385 diamonds scored across 4 quality tiers

Excellent

48 (12.5%)

Very Good

60 (15.6%)

Good

31 (8.1%)

Average

246 (63.9%)

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Consider Instead

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

Lab-Grown D I1Same specifications, lab-grown origin

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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