How much does a 0.20 to 0.49ct J SI1 natural round diamond cost?

As of November 2026, 0.20 to 0.49ct J SI1 natural round diamonds typically cost €213 EUR to €588 EUR, with a median price of €354 EUR. There are currently 3,362 diamonds matching this specification available across retailers.

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

About 47% of these diamonds are available at multiple retailers, with an average price spread of 47%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.20 to 0.49ct J SI1 Natural Round

Quick answer

As of November 2026, there are 3,362 natural round diamonds with J color and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run €213 EUR to €588 EUR, with a median of €354 EUR. At least 32 retailers stock this exact specification, and 47% of the stones appear at more than one of them, with an average price spread of 47%. Half of all listings fall between €731 EUR and €1,160 EUR per carat. The same specification in lab grown form lists at a median of about €651 EUR per carat. Over the last 30 days the median price moved -3.3% and the number of listings moved +6.8%.

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 natural stones in the index: 2,248 USD per carat, +7.6% 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

3,362

Lowest Price

€82 EUR

Highest Price

€1,523 EUR

Average Price

€385 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

47.5%

Price Spread

47.1%

30-Day Price Trend

-3.3%

30-Day Supply Change

+6.8%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,017/ct

10th Percentile

$621

Median

$1,017

90th Percentile

$1,785

Score Distribution

5.6K diamonds scored across 4 quality tiers

Excellent

1,092 (19.6%)

Very Good

1,354 (24.3%)

Good

1,765 (31.7%)

Average

1,351 (24.3%)

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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