How much does a 1.50 to 1.99ct H SI1 natural heart diamond cost?

As of October 2026, 1.50 to 1.99ct H SI1 natural heart diamonds typically cost $5,521 AUD to $16,749 AUD, with a median price of $9,289 AUD. There are currently 198 diamonds matching this specification available across retailers.

Where can I find the best price on a H SI1 heart diamond?

About 33% of these diamonds are available at multiple retailers, with an average price spread of 54%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct H SI1 Natural Heart

Quick answer

As of October 2026, there are 198 natural heart diamonds with H colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $5,521 AUD to $16,749 AUD, with a median of $9,289 AUD. At least 60 retailers stock this exact specification, and 33% of the stones appear at more than one of them, with an average price spread of 54%. Half of all listings fall between $4,139 AUD and $6,899 AUD per carat. The same specification in lab grown form lists at a median of about $749 AUD per carat. Over the last 30 days the median price moved -3.3% and the number of listings moved +15.9%.

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

198

Lowest Price

$3,265 AUD

Highest Price

$26,547 AUD

Average Price

$10,236 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

33.4%

Price Spread

53.5%

30-Day Price Trend

-3.3%

30-Day Supply Change

+15.9%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$3,628/ct

10th Percentile

$2,479

Median

$3,628

90th Percentile

$6,137

Score Distribution

649 diamonds scored across 4 quality tiers

Excellent

93 (14.3%)

Very Good

81 (12.5%)

Good

120 (18.5%)

Average

355 (54.7%)

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Consider Instead

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

H SI2SI2 inclusions are not visible without magnification

Save 17%

Lab-Grown H SI1Same specifications, lab-grown origin

Save 85%

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