How much does a 1.00 to 1.49ct I SI2 natural oval diamond cost?

As of September 2026, 1.00 to 1.49ct I SI2 natural oval diamonds typically cost £1,016 GBP to £2,956 GBP, with a median price of £1,740 GBP. There are currently 2,877 diamonds matching this specification available across retailers.

Where can I find the best price on a I SI2 oval diamond?

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

1.00 to 1.49ct I SI2 Natural Oval

Quick answer

As of September 2026, there are 2,877 natural oval diamonds with I colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £1,016 GBP to £2,956 GBP, with a median of £1,740 GBP. At least 52 retailers stock this exact specification. Half of all listings fall between £1,421 GBP and £2,150 GBP per carat. The same specification in lab grown form lists at a median of about £2,022 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. Oval natural stones in the index: 2,380 USD per carat, -9.6% 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

2,877

Lowest Price

£509 GBP

Highest Price

£9,404 GBP

Average Price

£1,888 GBP