How much does a 1.50 to 1.99ct I SI2 natural heart diamond cost?

As of November 2026, 1.50 to 1.99ct I SI2 natural heart diamonds typically cost $4,999 NZD to $15,087 NZD, with a median price of $8,279 NZD. There are currently 271 diamonds matching this specification available across retailers.

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

About 39% of these diamonds are available at multiple retailers, with an average price spread of 57%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I SI2 Natural Heart

Quick answer

As of November 2026, there are 271 natural heart diamonds with I colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $4,999 NZD to $15,087 NZD, with a median of $8,279 NZD. At least 52 retailers stock this exact specification, and 39% of the stones appear at more than one of them, with an average price spread of 57%. Half of all listings fall between $4,297 NZD and $7,389 NZD per carat. The same specification in lab grown form lists at a median of about $4,090 NZD per carat. Over the last 30 days the median price moved -1.9% and the number of listings moved +10.6%.

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. Heart natural stones in the index: 2,374 USD per carat, +9.8% 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: November 2026

Available

271

Lowest Price

$3,311 NZD

Highest Price

$32,124 NZD

Average Price

$9,404 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

38.5%

Price Spread

57.0%

30-Day Price Trend

-1.9%

30-Day Supply Change

+10.6%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$3,055/ct

10th Percentile

$2,007

Median

$3,055

90th Percentile

$5,334

Score Distribution

758 diamonds scored across 4 quality tiers

Excellent

177 (23.4%)

Very Good

114 (15.0%)

Good

163 (21.5%)

Average

304 (40.1%)

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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 20%

Lab-Grown I SI2Same specifications, lab-grown origin

Save 25%

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