How much does a 0.20 to 0.49ct D SI2 lab grown round diamond cost?

As of October 2026, 0.20 to 0.49ct D SI2 lab grown round diamonds typically cost $276 NZD to $850 NZD, with a median price of $394 NZD. There are currently 408 diamonds matching this specification available across retailers.

Where can I find the best price on a D SI2 round diamond?

About 33% of these diamonds are available at multiple retailers, with an average price spread of 121%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct D SI2 Lab Grown Round

Quick answer

As of October 2026, there are 408 lab grown round diamonds with D colour and SI2 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $276 NZD to $850 NZD, with a median of $394 NZD. At least 12 retailers stock this exact specification, and 33% of the stones appear at more than one of them, with an average price spread of 121%. Half of all listings fall between $679 NZD and $2,054 NZD per carat. The same specification in natural form lists at a median of about $2,619 NZD per carat. Over the last 30 days the median price moved -13.7% and the number of listings moved -22.1%.

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

408

Lowest Price

$105 NZD

Highest Price

$2,676 NZD

Average Price

$524 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

33.3%

Price Spread

121.4%

30-Day Price Trend

-13.7%

30-Day Supply Change

-22.1%

Volatility (30d)

0.07

Price Range

Price per carat distribution across retailers

$636/ct

10th Percentile

$317

Median

$636

90th Percentile

$1,499

Score Distribution

587 diamonds scored across 4 quality tiers

Excellent

136 (23.2%)

Very Good

264 (45.0%)

Good

41 (7.0%)

Average

146 (24.9%)

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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