How much does a 0.75 to 0.99ct I SI2 natural heart diamond cost?

As of October 2026, 0.75 to 0.99ct I SI2 natural heart diamonds typically cost €707 EUR to €2,191 EUR, with a median price of €1,014 EUR. There are currently 95 diamonds matching this specification available across retailers.

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

About 32% of these diamonds are available at multiple retailers, with an average price spread of 89%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct I SI2 Natural Heart

Quick answer

As of October 2026, there are 95 natural heart diamonds with I colour and SI2 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run €707 EUR to €2,191 EUR, with a median of €1,014 EUR. At least 53 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 89%. Half of all listings fall between €1,003 EUR and €2,196 EUR per carat. The same specification in lab grown form lists at a median of about €1,037 EUR per carat. Over the last 30 days the median price moved -1.8% and the number of listings moved +6.7%.

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

€460 EUR

Highest Price

€5,185 EUR

Average Price

€1,263 EUR