How much does a 0.75 to 0.99ct G SI1 natural cushion diamond cost?

As of November 2026, 0.75 to 0.99ct G SI1 natural cushion diamonds typically cost HK$6,516 HKD to HK$24,812 HKD, with a median price of HK$12,922 HKD. There are currently 212 diamonds matching this specification available across retailers.

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

About 30% of these diamonds are available at multiple retailers, with an average price spread of 80%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct G SI1 Natural Cushion

Quick answer

As of November 2026, there are 212 natural cushion diamonds with G colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run HK$6,516 HKD to HK$24,812 HKD, with a median of HK$12,922 HKD. At least 59 retailers stock this exact specification, and 30% of the stones appear at more than one of them, with an average price spread of 80%. Half of all listings fall between HK$10,990 HKD and HK$25,093 HKD per carat. The same specification in lab grown form lists at a median of about HK$5,730 HKD per carat. Over the last 30 days the median price moved -1.4% and the number of listings moved +1.8%.

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

212

Lowest Price

HK$4,645 HKD

Highest Price

HK$268,747 HKD

Average Price

HK$14,812 HKD