How much does a 1.50 to 1.99ct D SI1 natural oval diamond cost?

As of October 2026, 1.50 to 1.99ct D SI1 natural oval diamonds typically cost $12,359 NZD to $31,230 NZD, with a median price of $17,879 NZD. There are currently 373 diamonds matching this specification available across retailers.

Where can I find the best price on a D SI1 oval diamond?

About 29% of these diamonds are available at multiple retailers, with an average price spread of 43%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct D SI1 Natural Oval

Quick answer

As of October 2026, there are 373 natural oval diamonds with D colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $12,359 NZD to $31,230 NZD, with a median of $17,879 NZD. At least 63 retailers stock this exact specification, and 29% of the stones appear at more than one of them, with an average price spread of 43%. Half of all listings fall between $9,415 NZD and $14,236 NZD per carat. The same specification in lab grown form lists at a median of about $719 NZD per carat. Over the last 30 days the median price moved -1.5% and the number of listings moved +2.8%.

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

373

Lowest Price

$8,455 NZD

Highest Price

$45,446 NZD

Average Price

$20,097 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

28.5%

Price Spread

42.9%

30-Day Price Trend

-1.5%

30-Day Supply Change

+2.8%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$6,305/ct

10th Percentile

$4,565

Median

$6,305

90th Percentile

$9,691

Score Distribution

1.2K diamonds scored across 4 quality tiers

Excellent

128 (10.8%)

Very Good

249 (21.1%)

Good

216 (18.3%)

Average

589 (49.8%)

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Consider Instead

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

D SI2SI2 inclusions are not visible without magnification

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Lab-Grown D SI1Same 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