How much does a 0.75 to 0.99ct E SI1 natural heart diamond cost?

As of October 2026, 0.75 to 0.99ct E SI1 natural heart diamonds typically cost £782 GBP to £2,384 GBP, with a median price of £1,143 GBP. There are currently 134 diamonds matching this specification available across retailers.

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

About 31% of these diamonds are available at multiple retailers, with an average price spread of 78%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct E SI1 Natural Heart

Quick answer

As of October 2026, there are 134 natural heart diamonds with E colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run £782 GBP to £2,384 GBP, with a median of £1,143 GBP. At least 58 retailers stock this exact specification, and 31% of the stones appear at more than one of them, with an average price spread of 78%. Half of all listings fall between £1,120 GBP and £2,241 GBP per carat. The same specification in lab grown form lists at a median of about £268 GBP per carat. Over the last 30 days the median price moved -2.5% and the number of listings moved +7.7%.

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

134

Lowest Price

£520 GBP

Highest Price

£4,729 GBP

Average Price

£1,399 GBP