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

As of October 2026, 0.20 to 0.49ct G SI2 lab grown round diamonds typically cost $208 USD to $699 USD, with a median price of $218 USD. There are currently 81 diamonds matching this specification available across retailers.

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

About 11% of these diamonds are available at multiple retailers, with an average price spread of 37%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct G SI2 Lab Grown Round

Quick answer

As of October 2026, there are 81 lab grown round diamonds with G color and SI2 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run $208 USD to $699 USD, with a median of $218 USD. At least 9 retailers stock this exact specification, and 11% of the stones appear at more than one of them, with an average price spread of 37%. Half of all listings fall between $772 USD and $1,203 USD per carat. The same specification in natural form lists at a median of about $1,387 USD 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

Lowest Price

$146 USD

Highest Price

$1,998 USD

Average Price

$321 USD

Market Intelligence

Retailers Selling

Cross Retailer %

10.5%

Price Spread

37.4%

30-Day Price Trend

-0.4%

30-Day Supply Change

-70.2%

Volatility (30d)

0.11

Price Range

Price per carat distribution across retailers

$1,153/ct

10th Percentile

$339

Median

$1,153

90th Percentile

$1,203

Score Distribution

138 diamonds scored across 4 quality tiers

Excellent

5 (3.6%)

Very Good

69 (50.0%)

Good

33 (23.9%)

Average

31 (22.5%)

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H SI2H colour is visually identical to G to the naked eye

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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