How much does a 0.50 to 0.74ct J SI1 lab grown round diamond cost?

As of October 2026, 0.50 to 0.74ct J SI1 lab grown round diamonds typically cost HK$3,768 HKD to HK$12,638 HKD, with a median price of HK$8,176 HKD. There are currently 12 diamonds matching this specification available across retailers.

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

About 23% of these diamonds are available at multiple retailers, with an average price spread of 109%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct J SI1 Lab Grown Round

Quick answer

As of October 2026, there are 12 lab grown round diamonds with J colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run HK$3,768 HKD to HK$12,638 HKD, with a median of HK$8,176 HKD. At least 20 retailers stock this exact specification, and 23% of the stones appear at more than one of them, with an average price spread of 109%. Half of all listings fall between HK$4,759 HKD and HK$13,294 HKD per carat. The same specification in natural form lists at a median of about HK$9,779 HKD per carat. Over the last 30 days the median price moved -27.0% and the number of listings moved -74.2%.

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. Round lab grown stones in the index: 414 USD per carat, -5.0% 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$1,883 HKD

Highest Price

HK$14,641 HKD

Average Price

HK$7,777 HKD

Market Intelligence

Retailers Selling

Cross Retailer %

23.4%

Price Spread

108.8%

30-Day Price Trend

-27.0%

30-Day Supply Change

-74.2%

Volatility (30d)

0.19

Price Range

Price per carat distribution across retailers

$1,000/ct

10th Percentile

$444

Median

$1,000

90th Percentile

$2,108

Score Distribution

22 diamonds scored across 4 quality tiers

Excellent

1 (4.5%)

Very Good

1 (4.5%)

Good

11 (50.0%)

Average

9 (40.9%)

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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