How much does a 0.75 to 0.99ct I SI1 natural emerald diamond cost?

As of October 2026, 0.75 to 0.99ct I SI1 natural emerald diamonds typically cost £596 GBP to £1,471 GBP, with a median price of £817 GBP. There are currently 145 diamonds matching this specification available across retailers.

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

About 30% of these diamonds are available at multiple retailers, with an average price spread of 59%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct I SI1 Natural Emerald

Quick answer

As of October 2026, there are 145 natural emerald diamonds with I colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run £596 GBP to £1,471 GBP, with a median of £817 GBP. At least 59 retailers stock this exact specification, and 30% of the stones appear at more than one of them, with an average price spread of 59%. Half of all listings fall between £881 GBP and £1,513 GBP per carat. The same specification in lab grown form lists at a median of about £707 GBP per carat. Over the last 30 days the median price moved -2.1% and the number of listings moved +5.9%.

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. Emerald natural stones in the index: 2,278 USD per carat, +6.2% 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

145

Lowest Price

£357 GBP

Highest Price

£2,985 GBP

Average Price

£949 GBP