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

As of October 2026, 1.50 to 1.99ct I SI2 natural heart diamonds typically cost HK$22,376 HKD to HK$66,767 HKD, with a median price of HK$36,734 HKD. There are currently 272 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 October 2026, there are 272 natural heart diamonds with I colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run HK$22,376 HKD to HK$66,767 HKD, with a median of HK$36,734 HKD. 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 HK$18,906 HKD and HK$32,326 HKD per carat. The same specification in lab grown form lists at a median of about HK$17,697 HKD per carat. Over the last 30 days the median price moved -2.5% and the number of listings moved +11.6%.

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: October 2026

Available

272

Lowest Price

HK$14,691 HKD

Highest Price

HK$142,046 HKD

Average Price

HK$41,786 HKD

Market Intelligence

Retailers Selling

Cross Retailer %

38.5%

Price Spread

56.5%

30-Day Price Trend

-2.5%

30-Day Supply Change

+11.6%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$3,028/ct

10th Percentile

$2,008

Median

$3,028

90th Percentile

$5,279

Score Distribution

751 diamonds scored across 4 quality tiers

Excellent

176 (23.4%)

Very Good

112 (14.9%)

Good

163 (21.7%)

Average

300 (39.9%)

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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 18%

Lab-Grown I SI2Same specifications, lab-grown origin

Save 26%

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