How much does a 1.00 to 1.49ct I SI1 natural asscher diamond cost?

As of September 2026, 1.00 to 1.49ct I SI1 natural asscher diamonds typically cost £973 GBP to £2,948 GBP, with a median price of £1,614 GBP. There are currently 308 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct I SI1 Natural Asscher

Quick answer

As of September 2026, there are 308 natural asscher diamonds with I colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run £973 GBP to £2,948 GBP, with a median of £1,614 GBP. At least 53 retailers stock this exact specification. Half of all listings fall between £1,340 GBP and £2,193 GBP per carat. The same specification in lab grown form lists at a median of about £892 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. Asscher natural stones in the index: 2,601 USD per carat, +11.1% 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

308

Lowest Price

£677 GBP

Highest Price

£7,716 GBP

Average Price

£1,768 GBP