How much does a 0.20 to 0.49ct F SI1 lab grown round diamond cost?

As of October 2026, 0.20 to 0.49ct F SI1 lab grown round diamonds typically cost $285 NZD to $1,671 NZD, with a median price of $504 NZD. There are currently 155 diamonds matching this specification available across retailers.

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

About 22% of these diamonds are available at multiple retailers, with an average price spread of 251%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct F SI1 Lab Grown Round

Quick answer

As of October 2026, there are 155 lab grown round diamonds with F colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $285 NZD to $1,671 NZD, with a median of $504 NZD. At least 15 retailers stock this exact specification, and 22% of the stones appear at more than one of them, with an average price spread of 251%. Half of all listings fall between $546 NZD and $4,420 NZD per carat. The same specification in natural form lists at a median of about $2,745 NZD per carat. Over the last 30 days the median price moved -0.4% and the number of listings moved -70.2%.

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

155

Lowest Price

$105 NZD

Highest Price

$2,600 NZD

Average Price

$777 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

21.9%

Price Spread

250.9%

30-Day Price Trend

-0.4%

30-Day Supply Change

-70.2%

Volatility (30d)

0.11

Price Range

Price per carat distribution across retailers

$867/ct

10th Percentile

$229

Median

$867

90th Percentile

$3,401

Score Distribution

260 diamonds scored across 4 quality tiers

Excellent

61 (23.5%)

Very Good

67 (25.8%)

Good

93 (35.8%)

Average

39 (15.0%)

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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