How much does a 1.00 to 1.49ct E SI1 natural marquise diamond cost?

As of November 2026, 1.00 to 1.49ct E SI1 natural marquise diamonds typically cost £2,280 GBP to £5,565 GBP, with a median price of £3,105 GBP. There are currently 244 diamonds matching this specification available across retailers.

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

About 40% of these diamonds are available at multiple retailers, with an average price spread of 41%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct E SI1 Natural Marquise

Quick answer

As of November 2026, there are 244 natural marquise diamonds with E colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £2,280 GBP to £5,565 GBP, with a median of £3,105 GBP. At least 62 retailers stock this exact specification, and 40% of the stones appear at more than one of them, with an average price spread of 41%. Half of all listings fall between £2,719 GBP and £4,033 GBP per carat. The same specification in lab grown form lists at a median of about £289 GBP per carat. Over the last 30 days the median price moved +1.0% 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. 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: November 2026

Available

244

Lowest Price

£1,624 GBP

Highest Price

£14,509 GBP

Average Price

£3,697 GBP