How much does a 0.75 to 0.99ct F SI1 natural heart diamond cost?

As of October 2026, 0.75 to 0.99ct F SI1 natural heart diamonds typically cost $1,421 AUD to $4,655 AUD, with a median price of $2,244 AUD. There are currently 168 diamonds matching this specification available across retailers.

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

About 32% of these diamonds are available at multiple retailers, with an average price spread of 79%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct F SI1 Natural Heart

Quick answer

As of October 2026, there are 168 natural heart diamonds with F colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $1,421 AUD to $4,655 AUD, with a median of $2,244 AUD. At least 61 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 79%. Half of all listings fall between $1,928 AUD and $3,939 AUD per carat. The same specification in lab grown form lists at a median of about $603 AUD per carat. Over the last 30 days the median price moved -1.4% and the number of listings moved +7.9%.

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

168

Lowest Price

$982 AUD

Highest Price

$8,350 AUD

Average Price

$2,731 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

31.9%

Price Spread

79.3%

30-Day Price Trend

-1.4%

30-Day Supply Change

+7.9%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,782/ct

10th Percentile

$1,166

Median

$1,782

90th Percentile

$3,669

Score Distribution

506 diamonds scored across 4 quality tiers

Excellent

79 (15.6%)

Very Good

66 (13.0%)

Good

145 (28.7%)

Average

216 (42.7%)

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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

Save 14%

Lab-Grown F SI1Same specifications, lab-grown origin

Save 76%

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