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

As of October 2026, 1.00 to 1.49ct I SI1 natural emerald diamonds typically cost £1,109 GBP to £3,370 GBP, with a median price of £1,648 GBP. There are currently 264 diamonds matching this specification available across retailers.

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

About 39% of these diamonds are available at multiple retailers, with an average price spread of 53%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct I SI1 Natural Emerald

Quick answer

As of October 2026, there are 264 natural emerald diamonds with I colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,109 GBP to £3,370 GBP, with a median of £1,648 GBP. At least 62 retailers stock this exact specification, and 39% of the stones appear at more than one of them, with an average price spread of 53%. Half of all listings fall between £1,350 GBP and £2,219 GBP per carat. The same specification in lab grown form lists at a median of about £575 GBP per carat. Over the last 30 days the median price moved -2.3% and the number of listings moved +14.7%.

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. 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

264

Lowest Price

£750 GBP

Highest Price

£6,468 GBP

Average Price

£1,958 GBP