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

As of September 2026, 1.00 to 1.49ct I SI1 natural radiant diamonds typically cost HK$11,741 HKD to HK$34,198 HKD, with a median price of HK$18,802 HKD. There are currently 818 diamonds matching this specification available across retailers.

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

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

1.00 to 1.49ct I SI1 Natural Radiant

Quick answer

As of September 2026, there are 818 natural radiant diamonds with I colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run HK$11,741 HKD to HK$34,198 HKD, with a median of HK$18,802 HKD. At least 58 retailers stock this exact specification. Half of all listings fall between HK$15,131 HKD and HK$23,224 HKD per carat. The same specification in lab grown form lists at a median of about HK$10,948 HKD 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. Radiant natural stones in the index: 2,765 USD per carat, +6.0% 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

818

Lowest Price

HK$6,738 HKD

Highest Price

HK$60,293 HKD

Average Price

HK$21,008 HKD