How much does a 0.20 to 0.49ct I SI1 natural heart diamond cost?

As of October 2026, 0.20 to 0.49ct I SI1 natural heart diamonds typically cost $446 AUD to $843 AUD, with a median price of $630 AUD. There are currently 82 diamonds matching this specification available across retailers.

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

About 25% of these diamonds are available at multiple retailers, with an average price spread of 51%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct I SI1 Natural Heart

Quick answer

As of October 2026, there are 82 natural heart diamonds with I colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $446 AUD to $843 AUD, with a median of $630 AUD. At least 12 retailers stock this exact specification, and 25% of the stones appear at more than one of them, with an average price spread of 51%. Half of all listings fall between $1,631 AUD and $2,592 AUD per carat.

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

$177 AUD

Highest Price

$1,600 AUD

Average Price

$648 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

25.0%

Price Spread

50.8%

Price Range

Price per carat distribution across retailers

$1,328/ct

10th Percentile

$1,062

Median

$1,328

90th Percentile

$2,214

Score Distribution

207 diamonds scored across 4 quality tiers

Excellent

13 (6.3%)

Very Good

46 (22.2%)

Good

28 (13.5%)

Average

120 (58.0%)

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Consider Instead

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

J SI1J colour is visually identical to I to the naked eye

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I SI2SI2 inclusions are not visible without magnification

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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