How much does a 3.00 to 4.99ct D SI1 lab grown cushion diamond cost?

As of September 2026, 3.00 to 4.99ct D SI1 lab grown cushion diamonds typically cost HK$2,432 HKD to HK$33,786 HKD, with a median price of HK$9,670 HKD. There are currently 101 diamonds matching this specification available across retailers.

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

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3.00 to 4.99ct D SI1 Lab Grown Cushion

Quick answer

As of September 2026, there are 101 lab grown cushion diamonds with D colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run HK$2,432 HKD to HK$33,786 HKD, with a median of HK$9,670 HKD. At least 30 retailers stock this exact specification. Half of all listings fall between HK$2,020 HKD and HK$7,182 HKD per carat. The same specification in natural form lists at a median of about HK$136,717 HKD per carat.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Cushion lab grown stones in the index: 466 USD per carat, -14.7% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

101

Lowest Price

HK$2,298 HKD

Highest Price

HK$128,217 HKD

Average Price

HK$16,512 HKD

Market Intelligence

Retailers Selling

Price Spread

170.4%

Price Range

Price per carat distribution across retailers

$386/ct

10th Percentile

$194

Median

$386

90th Percentile

$1,314

Score Distribution

101 diamonds scored across 4 quality tiers

Excellent

25 (24.8%)

Very Good

15 (14.9%)

Good

14 (13.9%)

Average

47 (46.5%)

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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