How much does a 1.50 to 1.99ct G SI1 natural cushion diamond cost?

As of November 2026, 1.50 to 1.99ct G SI1 natural cushion diamonds typically cost HK$30,125 HKD to HK$87,139 HKD, with a median price of HK$54,841 HKD. There are currently 374 diamonds matching this specification available across retailers.

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

About 31% of these diamonds are available at multiple retailers, with an average price spread of 58%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct G SI1 Natural Cushion

Quick answer

As of November 2026, there are 374 natural cushion diamonds with G colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run HK$30,125 HKD to HK$87,139 HKD, with a median of HK$54,841 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 58%. Half of all listings fall between HK$27,399 HKD and HK$48,788 HKD per carat. The same specification in lab grown form lists at a median of about HK$3,725 HKD per carat. Over the last 30 days the median price moved -2.6% and the number of listings moved +4.7%.

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. 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: November 2026

Available

374

Lowest Price

HK$17,692 HKD

Highest Price

HK$175,287 HKD

Average Price

HK$57,555 HKD