How much does a 1.00 to 1.49ct J SI1 natural round diamond cost?

As of November 2026, 1.00 to 1.49ct J SI1 natural round diamonds typically cost €1,528 EUR to €4,297 EUR, with a median price of €2,323 EUR. There are currently 1,510 diamonds matching this specification available across retailers.

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

About 35% 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.

1.00 to 1.49ct J SI1 Natural Round

Quick answer

As of November 2026, there are 1,510 natural round diamonds with J color and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run €1,528 EUR to €4,297 EUR, with a median of €2,323 EUR. At least 62 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 47%. Half of all listings fall between €1,586 EUR and €2,481 EUR per carat. The same specification in lab grown form lists at a median of about €783 EUR per carat. Over the last 30 days the median price moved -1.3% and the number of listings moved +0.5%.

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

1,510

Lowest Price

€815 EUR

Highest Price

€8,458 EUR

Average Price

€2,632 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

35.3%

Price Spread

46.7%

30-Day Price Trend

-1.3%

30-Day Supply Change

+0.5%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$2,141/ct

10th Percentile

$1,491

Median

$2,141

90th Percentile

$3,881

Score Distribution

3.8K diamonds scored across 4 quality tiers

Excellent

430 (11.2%)

Very Good

789 (20.6%)

Good

804 (21.0%)

Average

1,805 (47.2%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

J SI2SI2 inclusions are not visible without magnification

Save 11%

Lab-Grown J SI1Same specifications, lab-grown origin

Save 48%

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