How much does a 1.50 to 1.99ct G SI2 natural round diamond cost?

As of October 2026, 1.50 to 1.99ct G SI2 natural round diamonds typically cost £2,395 GBP to £8,467 GBP, with a median price of £4,380 GBP. There are currently 2,017 diamonds matching this specification available across retailers.

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

About 44% of these diamonds are available at multiple retailers, with an average price spread of 57%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct G SI2 Natural Round

Quick answer

As of October 2026, there are 2,017 natural round diamonds with G colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £2,395 GBP to £8,467 GBP, with a median of £4,380 GBP. At least 62 retailers stock this exact specification, and 44% of the stones appear at more than one of them, with an average price spread of 57%. Half of all listings fall between £2,249 GBP and £3,994 GBP per carat. The same specification in lab grown form lists at a median of about £326 GBP per carat. Over the last 30 days the median price moved -1.9% and the number of listings moved +15.4%.

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. Round natural stones in the index: 2,248 USD per carat, +7.6% 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

2,017

Lowest Price

£1,229 GBP

Highest Price

£18,700 GBP

Average Price

£4,930 GBP