How much does a 0.50 to 0.74ct J I1 lab grown round diamond cost?

As of October 2026, 0.50 to 0.74ct J I1 lab grown round diamonds typically cost $319 NZD to $1,255 NZD, with a median price of $574 NZD. There are currently 13 diamonds matching this specification available across retailers.

Where can I find the best price on a J I1 round diamond?

About 4% of these diamonds are available at multiple retailers, with an average price spread of 115%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.50 to 0.74ct J I1 Lab Grown Round

Quick answer

As of October 2026, there are 13 lab grown round diamonds with J colour and I1 clarity in the 0.50 to 0.74ct range available across retailers worldwide. Prices typically run $319 NZD to $1,255 NZD, with a median of $574 NZD. At least 8 retailers stock this exact specification, and 4% of the stones appear at more than one of them, with an average price spread of 115%. Half of all listings fall between $771 NZD and $2,210 NZD per carat. The same specification in natural form lists at a median of about $1,760 NZD per carat.

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

$301 NZD

Highest Price

$1,483 NZD

Average Price

$729 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

3.6%

Price Spread

114.9%

Price Range

Price per carat distribution across retailers

$703/ct

10th Percentile

$322

Median

$703

90th Percentile

$1,778

Score Distribution

16 diamonds scored across 3 quality tiers

Very Good

6 (37.5%)

Good

9 (56.3%)

Average

1 (6.3%)

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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