How much does a 1.00 to 1.49ct J SI2 natural round diamond cost?

As of October 2026, 1.00 to 1.49ct J SI2 natural round diamonds typically cost €1,272 EUR to €3,858 EUR, with a median price of €2,085 EUR. There are currently 1,380 diamonds matching this specification available across retailers.

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

About 35% of these diamonds are available at multiple retailers, with an average price spread of 56%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct J SI2 Natural Round

Quick answer

As of October 2026, there are 1,380 natural round diamonds with J color and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run €1,272 EUR to €3,858 EUR, with a median of €2,085 EUR. At least 56 retailers stock this exact specification, and 35% of the stones appear at more than one of them, with an average price spread of 56%. Half of all listings fall between €1,374 EUR and €2,338 EUR per carat. The same specification in lab grown form lists at a median of about €833 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: October 2026

Available

1,380

Lowest Price

€603 EUR

Highest Price

€7,384 EUR

Average Price

€2,350 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

35.3%

Price Spread

56.3%

30-Day Price Trend

-1.3%

30-Day Supply Change

+0.5%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$1,911/ct

10th Percentile

$1,265

Median

$1,911

90th Percentile

$3,666

Score Distribution

3.6K diamonds scored across 4 quality tiers

Excellent

503 (13.9%)

Very Good

763 (21.0%)

Good

701 (19.3%)

Average

1,659 (45.8%)

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Consider Instead

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

J I1I1 inclusions are not visible without magnification

Save 14%

Lab-Grown J SI2Same specifications, lab-grown origin

Save 32%

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