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

As of September 2026, 1.00 to 1.49ct G SI1 lab grown radiant diamonds typically cost $316 AUD to $1,094 AUD, with a median price of $639 AUD. There are currently 136 diamonds matching this specification available across retailers.

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

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1.00 to 1.49ct G SI1 Lab Grown Radiant

Quick answer

As of September 2026, there are 136 lab grown radiant diamonds with G colour and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $316 AUD to $1,094 AUD, with a median of $639 AUD. At least 30 retailers stock this exact specification. Half of all listings fall between $428 AUD and $817 AUD per carat. The same specification in natural form lists at a median of about $4,946 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. Radiant lab grown stones in the index: 473 USD per carat, -12.5% 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

136

Lowest Price

$192 AUD

Highest Price

$4,347 AUD

Average Price

$687 AUD

Market Intelligence

Retailers Selling

Price Spread

60.2%

Price Range

Price per carat distribution across retailers

$463/ct

10th Percentile

$237

Median

$463

90th Percentile

$1,117

Score Distribution

136 diamonds scored across 4 quality tiers

Excellent

11 (8.1%)

Very Good

35 (25.7%)

Good

74 (54.4%)

Average

16 (11.8%)

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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