How much does a 1.50 to 1.99ct I VS1 natural marquise diamond cost?

As of October 2026, 1.50 to 1.99ct I VS1 natural marquise diamonds typically cost £5,495 GBP to £13,285 GBP, with a median price of £8,111 GBP. There are currently 28 diamonds matching this specification available across retailers.

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

About 28% of these diamonds are available at multiple retailers, with an average price spread of 33%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I VS1 Natural Marquise

Quick answer

As of October 2026, there are 28 natural marquise diamonds with I colour and VS1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £5,495 GBP to £13,285 GBP, with a median of £8,111 GBP. At least 54 retailers stock this exact specification, and 28% of the stones appear at more than one of them, with an average price spread of 33%. Half of all listings fall between £5,143 GBP and £7,135 GBP per carat. The same specification in lab grown form lists at a median of about £321 GBP per carat. Over the last 30 days the median price moved -1.1% and the number of listings moved +19.5%.

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

Lowest Price

£2,776 GBP

Highest Price

£22,548 GBP

Average Price

£9,345 GBP