How much does a 3.00 to 4.99ct E SI1 natural cushion diamond cost?

As of October 2026, 3.00 to 4.99ct E SI1 natural cushion diamonds typically cost HK$229,200 HKD to HK$652,467 HKD, with a median price of HK$370,408 HKD. There are currently 95 diamonds matching this specification available across retailers.

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

About 38% of these diamonds are available at multiple retailers, with an average price spread of 34%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct E SI1 Natural Cushion

Quick answer

As of October 2026, there are 95 natural cushion diamonds with E colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run HK$229,200 HKD to HK$652,467 HKD, with a median of HK$370,408 HKD. At least 54 retailers stock this exact specification, and 38% of the stones appear at more than one of them, with an average price spread of 34%. Half of all listings fall between HK$98,998 HKD and HK$139,610 HKD per carat. The same specification in lab grown form lists at a median of about HK$3,117 HKD per carat. Over the last 30 days the median price moved -1.4% and the number of listings moved +9.3%.

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. Cushion natural stones in the index: 2,948 USD per carat, +1.7% 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

Lowest Price

HK$159,494 HKD

Highest Price

HK$1,104,486 HKD

Average Price

HK$402,992 HKD