How much does a 0.50 to 0.74ct I SI1 lab grown radiant diamond cost?

As of October 2026, 0.50 to 0.74ct I SI1 lab grown radiant diamonds typically cost HK$2,779 HKD to HK$5,678 HKD, with a median price of HK$4,229 HKD. There are currently 2 diamonds matching this specification available across retailers.

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

About 50% of these diamonds are available at multiple retailers, with an average price spread of 89%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct I SI1 Lab Grown Radiant

Quick answer

As of October 2026, there are 2 lab grown radiant diamonds with I colour and SI1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run HK$2,779 HKD to HK$5,678 HKD, with a median of HK$4,229 HKD. At least 19 retailers stock this exact specification, and 50% of the stones appear at more than one of them, with an average price spread of 89%. Half of all listings fall between HK$2,770 HKD and HK$7,562 HKD per carat. The same specification in natural form lists at a median of about HK$11,701 HKD per carat. Over the last 30 days the median price moved +2.7% and the number of listings moved +20.2%.

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. Radiant lab grown stones in the index: 474 USD per carat, -2.1% 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$2,416 HKD

Highest Price

HK$12,036 HKD

Average Price

HK$4,229 HKD

Market Intelligence

Retailers Selling

Cross Retailer %

50.0%

Price Spread

89.2%

30-Day Price Trend

+2.7%

30-Day Supply Change

+20.2%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$685/ct

10th Percentile

$264

Median

$685

90th Percentile

$1,906

Score Distribution

2 diamonds scored across 2 quality tiers

Very Good

1 (50.0%)

Average

1 (50.0%)

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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