How much does a 1.50 to 1.99ct G SI1 natural oval diamond cost?

As of October 2026, 1.50 to 1.99ct G SI1 natural oval diamonds typically cost £4,558 GBP to £11,459 GBP, with a median price of £7,020 GBP. There are currently 307 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI1 oval diamond?

About 30% of these diamonds are available at multiple retailers, with an average price spread of 40%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct G SI1 Natural Oval

Quick answer

As of October 2026, there are 307 natural oval diamonds with G colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £4,558 GBP to £11,459 GBP, with a median of £7,020 GBP. At least 65 retailers stock this exact specification, and 30% of the stones appear at more than one of them, with an average price spread of 40%. Half of all listings fall between £3,718 GBP and £5,504 GBP per carat. The same specification in lab grown form lists at a median of about £366 GBP per carat. Over the last 30 days the median price moved -2.0% and the number of listings moved -1.2%.

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. Oval natural stones in the index: 2,655 USD per carat, +10.2% 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

307

Lowest Price

£1,974 GBP

Highest Price

£19,391 GBP

Average Price

£7,562 GBP