How much does a 0.50 to 0.74ct E SI1 natural marquise diamond cost?

As of October 2026, 0.50 to 0.74ct E SI1 natural marquise diamonds typically cost £461 GBP to £1,335 GBP, with a median price of £683 GBP. There are currently 580 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 44%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct E SI1 Natural Marquise

Quick answer

As of October 2026, there are 580 natural marquise diamonds with E colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run £461 GBP to £1,335 GBP, with a median of £683 GBP. At least 62 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 44%. Half of all listings fall between £1,137 GBP and £1,739 GBP per carat. The same specification in lab grown form lists at a median of about £383 GBP per carat. Over the last 30 days the median price moved -1.4% and the number of listings moved +6.8%.

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

580

Lowest Price

£312 GBP

Highest Price

£2,514 GBP

Average Price

£819 GBP