How much does a 0.50 to 0.74ct I SI1 natural round diamond cost?

As of October 2026, 0.50 to 0.74ct I SI1 natural round diamonds typically cost HK$3,883 HKD to HK$11,328 HKD, with a median price of HK$6,137 HKD. There are currently 5,906 diamonds matching this specification available across retailers.

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

About 35% of these diamonds are available at multiple retailers, with an average price spread of 50%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct I SI1 Natural Round

Quick answer

As of October 2026, there are 5,906 natural round diamonds with I colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run HK$3,883 HKD to HK$11,328 HKD, with a median of HK$6,137 HKD. At least 66 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 50%. Half of all listings fall between HK$9,773 HKD and HK$15,835 HKD per carat. The same specification in lab grown form lists at a median of about HK$9,229 HKD per carat. Over the last 30 days the median price moved -2.5% and the number of listings moved +8.2%.

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. 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

5,906

Lowest Price

HK$2,135 HKD

Highest Price

HK$25,017 HKD

Average Price

HK$7,015 HKD