How much does a 5.00ct+ J SI1 lab grown round diamond cost?

As of September 2026, 5.00ct+ J SI1 lab grown round diamonds typically cost HK$76,680 HKD to HK$864,244 HKD, with a median price of HK$395,855 HKD. There are currently 21 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

5.00ct+ J SI1 Lab Grown Round

Quick answer

As of September 2026, there are 21 lab grown round diamonds with J colour and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run HK$76,680 HKD to HK$864,244 HKD, with a median of HK$395,855 HKD. At least 4 retailers stock this exact specification. Half of all listings fall between HK$14,664 HKD and HK$54,025 HKD per carat. The same specification in natural form lists at a median of about HK$148,119 HKD per carat.

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

10.13ct Round J SI1, GIA, score 80 of 100, from HK$1,925,982 HKD

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. Round lab grown stones in the index: 438 USD per carat, -14.1% 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$74,233 HKD

Highest Price

HK$1,990,150 HKD

Average Price

HK$520,184 HKD

Market Intelligence

Retailers Selling

Price Spread

162.5%

Price Range

Price per carat distribution across retailers

$3,087/ct

10th Percentile

$1,806

Median

$3,087

90th Percentile

$9,345

Score Distribution

21 diamonds scored across 4 quality tiers

Excellent

1 (4.8%)

Very Good

10 (47.6%)

Good

3 (14.3%)

Average

7 (33.3%)

Find Your Diamond

Search 21 J SI1 round diamonds and compare prices.

Search Diamonds

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