How much does a 1.50 to 1.99ct D SI1 lab grown round diamond cost?

As of November 2026, 1.50 to 1.99ct D SI1 lab grown round diamonds typically cost €201 EUR to €1,444 EUR, with a median price of €689 EUR. There are currently 455 diamonds matching this specification available across retailers.

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

About 29% of these diamonds are available at multiple retailers, with an average price spread of 80%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct D SI1 Lab Grown Round

Quick answer

As of November 2026, there are 455 lab grown round diamonds with D color and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run €201 EUR to €1,444 EUR, with a median of €689 EUR. At least 44 retailers stock this exact specification, and 29% of the stones appear at more than one of them, with an average price spread of 80%. Half of all listings fall between €221 EUR and €504 EUR per carat. The same specification in natural form lists at a median of about €5,994 EUR per carat. Over the last 30 days the median price moved +4.9% and the number of listings moved +12.4%.

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

455

Lowest Price

€160 EUR

Highest Price

€2,638 EUR

Average Price

€743 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

29.5%

Price Spread

80.4%

30-Day Price Trend

+4.9%

30-Day Supply Change

+12.4%

Volatility (30d)

0.04

Price Range

Price per carat distribution across retailers

$394/ct

10th Percentile

$155

Median

$394

90th Percentile

$810

Score Distribution

969 diamonds scored across 4 quality tiers

Excellent

246 (25.4%)

Very Good

122 (12.6%)

Good

253 (26.1%)

Average

348 (35.9%)

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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