How much does a 1.00 to 1.49ct I SI1 natural heart diamond cost?

As of November 2026, 1.00 to 1.49ct I SI1 natural heart diamonds typically cost $1,965 AUD to $6,043 AUD, with a median price of $3,379 AUD. There are currently 350 diamonds matching this specification available across retailers.

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

About 45% of these diamonds are available at multiple retailers, with an average price spread of 57%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct I SI1 Natural Heart

Quick answer

As of November 2026, there are 350 natural heart diamonds with I colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,965 AUD to $6,043 AUD, with a median of $3,379 AUD. At least 65 retailers stock this exact specification, and 45% of the stones appear at more than one of them, with an average price spread of 57%. Half of all listings fall between $2,380 AUD and $4,099 AUD per carat. The same specification in lab grown form lists at a median of about $1,152 AUD per carat. Over the last 30 days the median price moved -0.5% and the number of listings moved +12.4%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Heart natural stones in the index: 2,289 USD per carat, -3.7% 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: November 2026

Available

350

Lowest Price

$1,240 AUD

Highest Price

$12,350 AUD

Average Price

$3,708 AUD