How much does a 2.00 to 2.99ct E SI1 natural marquise diamond cost?

As of October 2026, 2.00 to 2.99ct E SI1 natural marquise diamonds typically cost £13,284 GBP to £27,371 GBP, with a median price of £16,857 GBP. There are currently 45 diamonds matching this specification available across retailers.

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

About 37% of these diamonds are available at multiple retailers, with an average price spread of 26%. A comparison tool like Carat Hunter lets you see all the prices side by side.

2.00 to 2.99ct E SI1 Natural Marquise

Quick answer

As of October 2026, there are 45 natural marquise diamonds with E colour and SI1 clarity in the 2.00 to 2.99ct range available across retailers worldwide. Prices typically run £13,284 GBP to £27,371 GBP, with a median of £16,857 GBP. At least 59 retailers stock this exact specification, and 37% of the stones appear at more than one of them, with an average price spread of 26%. Half of all listings fall between £8,125 GBP and £10,473 GBP per carat. The same specification in lab grown form lists at a median of about £294 GBP per carat. Over the last 30 days the median price moved -0.7% and the number of listings moved +24.4%.

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. Marquise natural stones in the index: 2,268 USD per carat, +10.8% 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

£8,038 GBP

Highest Price

£55,475 GBP

Average Price

£20,230 GBP