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

As of November 2026, 0.20 to 0.49ct G SI1 lab grown round diamonds typically cost €152 EUR to €816 EUR, with a median price of €334 EUR. There are currently 52 diamonds matching this specification available across retailers.

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

About 22% of these diamonds are available at multiple retailers, with an average price spread of 252%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct G SI1 Lab Grown Round

Quick answer

As of November 2026, there are 52 lab grown round diamonds with G color and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run €152 EUR to €816 EUR, with a median of €334 EUR. 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 252%. Half of all listings fall between €280 EUR and €2,231 EUR per carat. The same specification in natural form lists at a median of about €1,377 EUR per carat. Over the last 30 days the median price moved +2.5% and the number of listings moved -39.4%.

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: November 2026

Available

Lowest Price

€38 EUR

Highest Price

€1,529 EUR

Average Price

€453 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

21.9%

Price Spread

251.6%

30-Day Price Trend

+2.5%

30-Day Supply Change

-39.4%

Volatility (30d)

0.10

Price Range

Price per carat distribution across retailers

$867/ct

10th Percentile

$224

Median

$867

90th Percentile

$3,401

Score Distribution

95 diamonds scored across 4 quality tiers

Excellent

13 (13.7%)

Very Good

29 (30.5%)

Good

19 (20.0%)

Average

34 (35.8%)

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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