How much does a 0.75 to 0.99ct D SI1 lab grown round diamond cost?

As of November 2026, 0.75 to 0.99ct D SI1 lab grown round diamonds typically cost €141 EUR to €1,056 EUR, with a median price of €439 EUR. There are currently 160 diamonds matching this specification available across retailers.

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

About 27% of these diamonds are available at multiple retailers, with an average price spread of 74%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct D SI1 Lab Grown Round

Quick answer

As of November 2026, there are 160 lab grown round diamonds with D color and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run €141 EUR to €1,056 EUR, with a median of €439 EUR. At least 32 retailers stock this exact specification, and 27% of the stones appear at more than one of them, with an average price spread of 74%. Half of all listings fall between €259 EUR and €542 EUR per carat. The same specification in natural form lists at a median of about €2,435 EUR per carat. Over the last 30 days the median price moved +3.2% and the number of listings moved +1.1%.

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

160

Lowest Price

€100 EUR

Highest Price

€1,430 EUR

Average Price

€473 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

26.8%

Price Spread

73.9%

30-Day Price Trend

+3.2%

30-Day Supply Change

+1.1%

Volatility (30d)

0.03

Price Range

Price per carat distribution across retailers

$427/ct

10th Percentile

$185

Median

$427

90th Percentile

$1,086

Score Distribution

361 diamonds scored across 4 quality tiers

Excellent

95 (26.3%)

Very Good

47 (13.0%)

Good

92 (25.5%)

Average

127 (35.2%)

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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