How much does a 0.75 to 0.99ct I SI2 lab grown round diamond cost?

As of November 2026, 0.75 to 0.99ct I SI2 lab grown round diamonds typically cost €151 EUR to €1,020 EUR, with a median price of €704 EUR. There are currently 5 diamonds matching this specification available across retailers.

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

About 19% of these diamonds are available at multiple retailers, with an average price spread of 73%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct I SI2 Lab Grown Round

Quick answer

As of November 2026, there are 5 lab grown round diamonds with I color and SI2 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run €151 EUR to €1,020 EUR, with a median of €704 EUR. At least 20 retailers stock this exact specification, and 19% of the stones appear at more than one of them, with an average price spread of 73%. Half of all listings fall between €681 EUR and €1,358 EUR per carat. The same specification in natural form lists at a median of about €1,526 EUR per carat. Over the last 30 days the median price moved -44.3% and the number of listings moved -33.3%.

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 lab grown stones in the index: 414 USD per carat, -5.0% 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

Lowest Price

€80 EUR

Highest Price

€2,860 EUR

Average Price

€645 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

18.9%

Price Spread

72.8%

30-Day Price Trend

-44.3%

30-Day Supply Change

-33.3%

Volatility (30d)

0.06

Price Range

Price per carat distribution across retailers

$1,038/ct

10th Percentile

$397

Median

$1,038

90th Percentile

$2,273

Score Distribution

13 diamonds scored across 4 quality tiers

Excellent

2 (15.4%)

Very Good

2 (15.4%)

Good

5 (38.5%)

Average

4 (30.8%)

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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