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

As of October 2026, 0.75 to 0.99ct G SI1 lab grown cushion diamonds typically cost HK$1,879 HKD to HK$11,629 HKD, with a median price of HK$4,772 HKD. There are currently 2 diamonds matching this specification available across retailers.

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

About 21% of these diamonds are available at multiple retailers, with an average price spread of 51%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct G SI1 Lab Grown Cushion

Quick answer

As of October 2026, there are 2 lab grown cushion diamonds with G colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run HK$1,879 HKD to HK$11,629 HKD, with a median of HK$4,772 HKD. At least 22 retailers stock this exact specification, and 21% of the stones appear at more than one of them, with an average price spread of 51%. Half of all listings fall between HK$3,710 HKD and HK$6,667 HKD per carat. The same specification in natural form lists at a median of about HK$17,710 HKD per carat. Over the last 30 days the median price moved +17.0% and the number of listings moved -10.3%.

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 lab grown stones in the index: 516 USD per carat, +6.9% 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$1,349 HKD

Highest Price

HK$14,438 HKD

Average Price

HK$6,045 HKD

Market Intelligence

Retailers Selling

Cross Retailer %

20.6%

Price Spread

51.5%

30-Day Price Trend

+17.0%

30-Day Supply Change

-10.3%

Volatility (30d)

0.07

Price Range

Price per carat distribution across retailers

$732/ct

10th Percentile

$379

Median

$732

90th Percentile

$1,083

Score Distribution

7 diamonds scored across 4 quality tiers

Excellent

1 (14.3%)

Very Good

2 (28.6%)

Good

1 (14.3%)

Average

3 (42.9%)

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Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1