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

As of November 2026, 1.50 to 1.99ct I SI2 lab grown radiant diamonds typically cost €946 EUR to €5,350 EUR, with a median price of €1,721 EUR. There are currently 2 diamonds matching this specification available across retailers.

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

About 45% of these diamonds are available at multiple retailers, with an average price spread of 75%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I SI2 Lab Grown Radiant

Quick answer

As of November 2026, there are 2 lab grown radiant diamonds with I color and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run €946 EUR to €5,350 EUR, with a median of €1,721 EUR. At least 12 retailers stock this exact specification, and 45% of the stones appear at more than one of them, with an average price spread of 75%. Half of all listings fall between €772 EUR and €1,521 EUR per carat. The same specification in natural form lists at a median of about €3,403 EUR per carat. Over the last 30 days the median price moved +1.4% and the number of listings moved -6.2%.

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. Radiant lab grown stones in the index: 474 USD per carat, -2.1% 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

€752 EUR

Highest Price

€6,257 EUR

Average Price

€2,910 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

45.5%

Price Spread

75.5%

30-Day Price Trend

+1.4%

30-Day Supply Change

-6.2%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,109/ct

10th Percentile

$749

Median

$1,109

90th Percentile

$2,569

Score Distribution

3 diamonds scored across 2 quality tiers

Excellent

1 (33.3%)

Average

2 (66.7%)

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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