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 $1,108 AUD to $8,307 AUD, with a median price of $2,668 AUD. There are currently 244 diamonds matching this specification available across retailers.

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

Compare prices across retailers on Carat Hunter to see all your options.

1.00 to 1.49ct I SI2 Lab Grown Round

Quick answer

As of September 2026, there are 244 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 $1,108 AUD to $8,307 AUD, with a median of $2,668 AUD. At least 25 retailers stock this exact specification. Half of all listings fall between $4,006 AUD and $6,234 AUD per carat. The same specification in natural form lists at a median of about $3,915 AUD 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

244

Lowest Price

$403 AUD

Highest Price

$14,080 AUD

Average Price

$3,419 AUD

Market Intelligence

Retailers Selling

Price Spread

43.0%

Price Range

Price per carat distribution across retailers

$3,370/ct

10th Percentile

$1,882

Median

$3,370

90th Percentile

$4,977

Score Distribution

244 diamonds scored across 4 quality tiers

Excellent

27 (11.1%)

Very Good

134 (54.9%)

Good

31 (12.7%)

Average

52 (21.3%)

Find Your Diamond

Search 244 I SI2 round diamonds and compare prices.

Search Diamonds

Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

J SI2J colour is visually identical to I to the naked eye

Save 47%

I I1I1 inclusions are not visible without magnification

Save 39%

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