How much does a 1.50 to 1.99ct I SI2 lab grown round diamond cost?

As of November 2026, 1.50 to 1.99ct I SI2 lab grown round diamonds typically cost €752 EUR to €1,847 EUR, with a median price of €909 EUR. There are currently 154 diamonds matching this specification available across retailers.

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

About 46% of these diamonds are available at multiple retailers, with an average price spread of 87%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I SI2 Lab Grown Round

Quick answer

As of November 2026, there are 154 lab grown round diamonds with I color and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run €752 EUR to €1,847 EUR, with a median of €909 EUR. At least 30 retailers stock this exact specification, and 46% of the stones appear at more than one of them, with an average price spread of 87%. Half of all listings fall between €796 EUR and €1,538 EUR per carat. The same specification in natural form lists at a median of about €3,358 EUR per carat. Over the last 30 days the median price moved -7.6% and the number of listings moved +10.2%.

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 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

154

Lowest Price

€271 EUR

Highest Price

€6,973 EUR

Average Price

€1,310 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

45.6%

Price Spread

87.3%

30-Day Price Trend

-7.6%

30-Day Supply Change

+10.2%

Volatility (30d)

0.00

Price Range

Price per carat distribution across retailers

$949/ct

10th Percentile

$570

Median

$949

90th Percentile

$2,708

Score Distribution

280 diamonds scored across 4 quality tiers

Excellent

140 (50.0%)

Very Good

8 (2.9%)

Good

127 (45.4%)

Average

5 (1.8%)

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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