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

As of October 2026, 1.50 to 1.99ct F SI1 natural heart diamonds typically cost $6,554 AUD to $20,652 AUD, with a median price of $13,589 AUD. There are currently 88 diamonds matching this specification available across retailers.

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

About 30% of these diamonds are available at multiple retailers, with an average price spread of 61%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct F SI1 Natural Heart

Quick answer

As of October 2026, there are 88 natural heart diamonds with F colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $6,554 AUD to $20,652 AUD, with a median of $13,589 AUD. At least 57 retailers stock this exact specification, and 30% of the stones appear at more than one of them, with an average price spread of 61%. Half of all listings fall between $4,921 AUD and $8,747 AUD per carat. The same specification in lab grown form lists at a median of about $506 AUD per carat. Over the last 30 days the median price moved -2.5% 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

Lowest Price

$4,532 AUD

Highest Price

$32,338 AUD

Average Price

$13,664 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

29.9%

Price Spread

60.8%

30-Day Price Trend

-2.5%

30-Day Supply Change

+15.9%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$4,428/ct

10th Percentile

$2,863

Median

$4,428

90th Percentile

$7,542

Score Distribution

361 diamonds scored across 4 quality tiers

Excellent

38 (10.5%)

Very Good

47 (13.0%)

Good

58 (16.1%)

Average

218 (60.4%)

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Consider Instead

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

F SI2SI2 inclusions are not visible without magnification

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Lab-Grown F SI1Same specifications, lab-grown origin

Save 92%

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