How much does a 0.50 to 0.74ct I VS1 natural marquise diamond cost?

As of October 2026, 0.50 to 0.74ct I VS1 natural marquise diamonds typically cost £429 GBP to £1,289 GBP, with a median price of £700 GBP. There are currently 335 diamonds matching this specification available across retailers.

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

About 35% of these diamonds are available at multiple retailers, with an average price spread of 48%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct I VS1 Natural Marquise

Quick answer

As of October 2026, there are 335 natural marquise diamonds with I colour and VS1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run £429 GBP to £1,289 GBP, with a median of £700 GBP. At least 62 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 48%. Half of all listings fall between £1,128 GBP and £1,798 GBP per carat. The same specification in lab grown form lists at a median of about £616 GBP per carat. Over the last 30 days the median price moved -2.0% and the number of listings moved +14.3%.

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

335

Lowest Price

£261 GBP

Highest Price

£2,546 GBP

Average Price

£800 GBP