How much does a 1.00 to 1.49ct D SI1 lab grown radiant diamond cost?

As of November 2026, 1.00 to 1.49ct D SI1 lab grown radiant diamonds typically cost €129 EUR to €971 EUR, with a median price of €434 EUR. There are currently 125 diamonds matching this specification available across retailers.

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

About 36% of these diamonds are available at multiple retailers, with an average price spread of 83%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct D SI1 Lab Grown Radiant

Quick answer

As of November 2026, there are 125 lab grown radiant diamonds with D color and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run €129 EUR to €971 EUR, with a median of €434 EUR. At least 39 retailers stock this exact specification, and 36% of the stones appear at more than one of them, with an average price spread of 83%. Half of all listings fall between €217 EUR and €540 EUR per carat. The same specification in natural form lists at a median of about €3,664 EUR per carat. Over the last 30 days the median price moved +2.7% and the number of listings moved +16.4%.

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. 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

125

Lowest Price

€104 EUR

Highest Price

€1,701 EUR

Average Price

€460 EUR

Market Intelligence

Retailers Selling

Cross Retailer %

35.8%

Price Spread

82.8%

30-Day Price Trend

+2.7%

30-Day Supply Change

+16.4%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$435/ct

10th Percentile

$156

Median

$435

90th Percentile

$960

Score Distribution

208 diamonds scored across 4 quality tiers

Excellent

54 (26.0%)

Very Good

26 (12.5%)

Good

71 (34.1%)

Average

57 (27.4%)

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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