How much does a 3.00 to 4.99ct G SI2 lab grown cushion diamond cost?

As of October 2026, 3.00 to 4.99ct G SI2 lab grown cushion diamonds typically cost HK$4,951 HKD to HK$24,541 HKD, with a median price of HK$10,647 HKD. There are currently 6 diamonds matching this specification available across retailers.

Where can I find the best price on a G SI2 cushion diamond?

About 32% of these diamonds are available at multiple retailers, with an average price spread of 117%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct G SI2 Lab Grown Cushion

Quick answer

As of October 2026, there are 6 lab grown cushion diamonds with G colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run HK$4,951 HKD to HK$24,541 HKD, with a median of HK$10,647 HKD. At least 22 retailers stock this exact specification, and 32% of the stones appear at more than one of them, with an average price spread of 117%. Half of all listings fall between HK$1,806 HKD and HK$5,058 HKD per carat. The same specification in natural form lists at a median of about HK$97,338 HKD per carat. Over the last 30 days the median price moved +9.4% and the number of listings moved +7.4%.

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$3,476 HKD

Highest Price

HK$56,620 HKD

Average Price

HK$13,792 HKD

Market Intelligence

Retailers Selling

Cross Retailer %

31.6%

Price Spread

117.4%

30-Day Price Trend

+9.4%

30-Day Supply Change

+7.4%

Volatility (30d)

0.04

Price Range

Price per carat distribution across retailers

$353/ct

10th Percentile

$188

Median

$353

90th Percentile

$1,079

Score Distribution

23 diamonds scored across 4 quality tiers

Excellent

4 (17.4%)

Very Good

4 (17.4%)

Good

5 (21.7%)

Average

10 (43.5%)

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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