How much does a 1.00 to 1.49ct E SI2 natural marquise diamond cost?

As of October 2026, 1.00 to 1.49ct E SI2 natural marquise diamonds typically cost £1,485 GBP to £4,241 GBP, with a median price of £2,229 GBP. There are currently 489 diamonds matching this specification available across retailers.

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

About 39% of these diamonds are available at multiple retailers, with an average price spread of 50%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct E SI2 Natural Marquise

Quick answer

As of October 2026, there are 489 natural marquise diamonds with E colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,485 GBP to £4,241 GBP, with a median of £2,229 GBP. At least 57 retailers stock this exact specification, and 39% of the stones appear at more than one of them, with an average price spread of 50%. Half of all listings fall between £2,026 GBP and £3,285 GBP per carat. The same specification in lab grown form lists at a median of about £231 GBP per carat. Over the last 30 days the median price moved +0.8% and the number of listings moved +17.8%.

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

489

Lowest Price

£841 GBP

Highest Price

£14,509 GBP

Average Price

£2,641 GBP