How much does a 1.00 to 1.49ct I SI2 lab grown round diamond cost?

As of September 2026, 1.00 to 1.49ct I SI2 lab grown round diamonds typically cost €499 EUR to €4,735 EUR, with a median price of €1,560 EUR. There are currently 226 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct I SI2 Lab Grown Round

Quick answer

As of September 2026, there are 226 lab grown round diamonds with I colour and SI2 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run €499 EUR to €4,735 EUR, with a median of €1,560 EUR. At least 24 retailers stock this exact specification. Half of all listings fall between €2,258 EUR and €3,522 EUR per carat. The same specification in natural form lists at a median of about €2,197 EUR per carat.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, August 2026: natural diamonds at 2,184 USD per carat and lab-grown at 464 USD per carat, a natural to lab ratio of 4.7 to 1. Round lab grown stones in the index: 438 USD per carat, -14.1% month on month. See the full index release

Figures come from live listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: September 2026

Available

226

Lowest Price

€227 EUR

Highest Price

€7,931 EUR

Average Price

€2,052 EUR

Market Intelligence

Retailers Selling

Price Spread

43.2%

Price Range

Price per carat distribution across retailers

$3,377/ct

10th Percentile

$1,880

Median

$3,377

90th Percentile

$4,987

Score Distribution

226 diamonds scored across 4 quality tiers

Excellent

30 (13.3%)

Very Good

106 (46.9%)

Good

31 (13.7%)

Average

59 (26.1%)

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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