How much does a 0.75 to 0.99ct J SI1 natural round diamond cost?

As of November 2026, 0.75 to 0.99ct J SI1 natural round diamonds typically cost €826 EUR to €2,301 EUR, with a median price of €1,273 EUR. There are currently 928 diamonds matching this specification available across retailers.

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

About 40% of these diamonds are available at multiple retailers, with an average price spread of 53%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct J SI1 Natural Round

Quick answer

As of November 2026, there are 928 natural round diamonds with J color and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run €826 EUR to €2,301 EUR, with a median of €1,273 EUR. At least 62 retailers stock this exact specification, and 40% of the stones appear at more than one of them, with an average price spread of 53%. Half of all listings fall between €1,141 EUR and €1,889 EUR per carat. The same specification in lab grown form lists at a median of about €1,088 EUR per carat. Over the last 30 days the median price moved -1.6% and the number of listings moved +12.6%.

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

928

Lowest Price

€376 EUR

Highest Price

€3,900 EUR

Average Price

€1,441 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

39.8%

Price Spread

53.2%

30-Day Price Trend

-1.6%

30-Day Supply Change

+12.6%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,571/ct

10th Percentile

$1,089

Median

$1,571

90th Percentile

$3,163

Score Distribution

2.3K diamonds scored across 4 quality tiers

Excellent

318 (13.9%)

Very Good

491 (21.4%)

Good

516 (22.5%)

Average

968 (42.2%)

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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 9%

Lab-Grown J SI1Same specifications, lab-grown origin

Save 23%

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