How much does a 3.00 to 4.99ct I SI1 natural oval diamond cost?

As of October 2026, 3.00 to 4.99ct I SI1 natural oval diamonds typically cost HK$220,815 HKD to HK$549,711 HKD, with a median price of HK$340,946 HKD. There are currently 150 diamonds matching this specification available across retailers.

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

About 31% of these diamonds are available at multiple retailers, with an average price spread of 29%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct I SI1 Natural Oval

Quick answer

As of October 2026, there are 150 natural oval diamonds with I colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run HK$220,815 HKD to HK$549,711 HKD, with a median of HK$340,946 HKD. At least 60 retailers stock this exact specification, and 31% of the stones appear at more than one of them, with an average price spread of 29%. Half of all listings fall between HK$83,713 HKD and HK$112,121 HKD per carat. The same specification in lab grown form lists at a median of about HK$3,895 HKD per carat. Over the last 30 days the median price moved +0.4% and the number of listings moved +0.7%.

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

150

Lowest Price

HK$85,957 HKD

Highest Price

HK$1,075,773 HKD

Average Price

HK$366,081 HKD