How much does a 0.20 to 0.49ct I SI2 natural heart diamond cost?

As of October 2026, 0.20 to 0.49ct I SI2 natural heart diamonds typically cost $390 AUD to $724 AUD, with a median price of $578 AUD. There are currently 39 diamonds matching this specification available across retailers.

Where can I find the best price on a I SI2 heart diamond?

About 13% of these diamonds are available at multiple retailers, with an average price spread of 14%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct I SI2 Natural Heart

Quick answer

As of October 2026, there are 39 natural heart diamonds with I colour and SI2 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $390 AUD to $724 AUD, with a median of $578 AUD. At least 9 retailers stock this exact specification, and 13% of the stones appear at more than one of them, with an average price spread of 14%. Half of all listings fall between $1,561 AUD and $1,798 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

$198 AUD

Highest Price

$1,341 AUD

Average Price

$577 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

12.5%

Price Spread

14.3%

Price Range

Price per carat distribution across retailers

$1,164/ct

10th Percentile

$1,073

Median

$1,164

90th Percentile

$1,380

Score Distribution

108 diamonds scored across 4 quality tiers

Excellent

8 (7.4%)

Very Good

23 (21.3%)

Good

13 (12.0%)

Average

64 (59.3%)

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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