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

As of October 2026, 0.20 to 0.49ct F SI1 lab grown oval diamonds typically cost $237 NZD to $673 NZD, with a median price of $537 NZD. There are currently 14 diamonds matching this specification available across retailers.

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

About 50% of these diamonds are available at multiple retailers, with an average price spread of 119%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct F SI1 Lab Grown Oval

Quick answer

As of October 2026, there are 14 lab grown oval diamonds with F colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $237 NZD to $673 NZD, with a median of $537 NZD. At least 13 retailers stock this exact specification, and 50% of the stones appear at more than one of them, with an average price spread of 119%. Half of all listings fall between $455 NZD and $1,378 NZD per carat. The same specification in natural form lists at a median of about $2,435 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. Oval lab grown stones in the index: 453 USD per carat, -7.4% 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

$93 NZD

Highest Price

$1,759 NZD

Average Price

$528 NZD

Market Intelligence

Retailers Selling

Cross Retailer %

50.0%

Price Spread

119.0%

Price Range

Price per carat distribution across retailers

$436/ct

10th Percentile

$226

Median

$436

90th Percentile

$967

Score Distribution

29 diamonds scored across 4 quality tiers

Excellent

2 (6.9%)

Very Good

2 (6.9%)

Good

16 (55.2%)

Average

9 (31.0%)

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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