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

As of October 2026, 0.20 to 0.49ct J SI1 natural round diamonds typically cost €214 EUR to €591 EUR, with a median price of €357 EUR. There are currently 3,306 diamonds matching this specification available across retailers.

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

About 48% of these diamonds are available at multiple retailers, with an average price spread of 48%. 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 October 2026, there are 3,306 natural round diamonds with J colour and SI1 clarity in the 0.20 to 0.49ct range available across retailers worldwide. Prices typically run €214 EUR to €591 EUR, with a median of €357 EUR. At least 32 retailers stock this exact specification, and 48% of the stones appear at more than one of them, with an average price spread of 48%. Half of all listings fall between €733 EUR and €1,168 EUR per carat. The same specification in lab grown form lists at a median of about €671 EUR per carat. Over the last 30 days the median price moved -1.8% and the number of listings moved +4.2%.

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 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: October 2026

Available

3,306

Lowest Price

€83 EUR

Highest Price

€1,529 EUR

Average Price

€389 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

47.9%

Price Spread

47.7%

30-Day Price Trend

-1.8%

30-Day Supply Change

+4.2%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$1,015/ct

10th Percentile

$621

Median

$1,015

90th Percentile

$1,789

Score Distribution

5.5K diamonds scored across 4 quality tiers

Excellent

1,087 (19.7%)

Very Good

1,293 (23.5%)

Good

1,755 (31.9%)

Average

1,372 (24.9%)

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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