How much does a 1.00 to 1.49ct I SI1 lab grown round diamond cost?

As of September 2026, 1.00 to 1.49ct I SI1 lab grown round diamonds typically cost $928 CAD to $3,628 CAD, with a median price of $1,905 CAD. There are currently 732 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct I SI1 Lab Grown Round

Quick answer

As of September 2026, there are 732 lab grown round diamonds with I color and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $928 CAD to $3,628 CAD, with a median of $1,905 CAD. At least 28 retailers stock this exact specification. Half of all listings fall between $1,874 CAD and $6,303 CAD per carat. The same specification in natural form lists at a median of about $4,255 CAD 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

732

Lowest Price

$191 CAD

Highest Price

$15,280 CAD

Average Price

$2,321 CAD

Market Intelligence

Retailers Selling

Price Spread

93.2%

Price Range

Price per carat distribution across retailers

$3,430/ct

10th Percentile

$1,267

Median

$3,430

90th Percentile

$5,324

Score Distribution

732 diamonds scored across 4 quality tiers

Excellent

139 (19.0%)

Very Good

477 (65.2%)

Good

53 (7.2%)

Average

63 (8.6%)

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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