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

As of October 2026, 1.50 to 1.99ct E SI1 natural heart diamonds typically cost $6,971 AUD to $22,800 AUD, with a median price of $12,929 AUD. There are currently 78 diamonds matching this specification available across retailers.

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

About 29% 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.

1.50 to 1.99ct E SI1 Natural Heart

Quick answer

As of October 2026, there are 78 natural heart diamonds with E colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $6,971 AUD to $22,800 AUD, with a median of $12,929 AUD. At least 54 retailers stock this exact specification, and 29% of the stones appear at more than one of them, with an average price spread of 51%. Half of all listings fall between $5,569 AUD and $9,071 AUD per carat. The same specification in lab grown form lists at a median of about $483 AUD per carat. Over the last 30 days the median price moved -0.1% and the number of listings moved +10.0%.

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

$4,836 AUD

Highest Price

$35,159 AUD

Average Price

$14,106 AUD