How much does a 3.00 to 4.99ct J SI1 lab grown marquise diamond cost?

As of September 2026, 3.00 to 4.99ct J SI1 lab grown marquise diamonds typically cost HK$57,808 HKD to HK$65,585 HKD, with a median price of HK$60,515 HKD. There are currently 77 diamonds matching this specification available across retailers.

Where can I find the best price on a J SI1 marquise diamond?

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3.00 to 4.99ct J SI1 Lab Grown Marquise

Quick answer

As of September 2026, there are 77 lab grown marquise diamonds with J colour and SI1 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run HK$57,808 HKD to HK$65,585 HKD, with a median of HK$60,515 HKD. At least 2 retailers stock this exact specification. Half of all listings fall between HK$18,960 HKD and HK$19,553 HKD per carat. The same specification in natural form lists at a median of about HK$68,294 HKD per carat.

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. Marquise lab grown stones in the index: 500 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

Lowest Price

HK$57,177 HKD

Highest Price

HK$288,738 HKD

Average Price

HK$65,796 HKD

Market Intelligence

Retailers Selling

Price Spread

3.1%

Price Range

Price per carat distribution across retailers

$2,498/ct

10th Percentile

$2,275

Median

$2,498

90th Percentile

$2,579

Score Distribution

77 diamonds scored across 3 quality tiers

Very Good

11 (14.3%)

Good

55 (71.4%)

Average

11 (14.3%)

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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