How much does a 5.00ct+ I VS1 natural marquise diamond cost?

As of September 2026, 5.00ct+ I VS1 natural marquise diamonds typically cost £68,158 GBP to £198,762 GBP, with a median price of £120,822 GBP. There are currently 14 diamonds matching this specification available across retailers.

Where can I find the best price on a I VS1 marquise diamond?

Compare prices across retailers on Carat Hunter to see all your options.

5.00ct+ I VS1 Natural Marquise

Quick answer

As of September 2026, there are 14 natural marquise diamonds with I colour and VS1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run £68,158 GBP to £198,762 GBP, with a median of £120,822 GBP. At least 9 retailers stock this exact specification. Half of all listings fall between £11,095 GBP and £17,564 GBP per carat. The same specification in lab grown form lists at a median of about £386 GBP per carat.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Marquise natural stones in the index: 2,114 USD per carat, -8.8% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

Lowest Price

£58,034 GBP

Highest Price

£218,497 GBP

Average Price

£130,259 GBP