How much does a 0.50 to 0.74ct E SI2 lab grown radiant diamond cost?

As of October 2026, 0.50 to 0.74ct E SI2 lab grown radiant diamonds typically cost $631 NZD to $2,001 NZD, with a median price of $920 NZD. There are currently 2 diamonds matching this specification available across retailers.

Where can I find the best price on a E SI2 radiant diamond?

About 11% of these diamonds are available at multiple retailers, with an average price spread of 72%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct E SI2 Lab Grown Radiant

Quick answer

As of October 2026, there are 2 lab grown radiant diamonds with E colour and SI2 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run $631 NZD to $2,001 NZD, with a median of $920 NZD. At least 15 retailers stock this exact specification, and 11% of the stones appear at more than one of them, with an average price spread of 72%. Half of all listings fall between $799 NZD and $1,689 NZD per carat. The same specification in natural form lists at a median of about $2,834 NZD per carat. Over the last 30 days the median price moved -0.2% and the number of listings moved +2.6%.

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

$623 NZD

Highest Price

$2,498 NZD

Average Price

$1,188 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

11.1%

Price Spread

72.5%

30-Day Price Trend

-0.2%

30-Day Supply Change

+2.6%

Volatility (30d)

0.03

Price Range

Price per carat distribution across retailers

$690/ct

10th Percentile

$260

Median

$690

90th Percentile

$1,327

Score Distribution

5 diamonds scored across 2 quality tiers

Good

1 (20.0%)

Average

4 (80.0%)

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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