How much does a 1.50 to 1.99ct G SI2 lab grown radiant diamond cost?

As of October 2026, 1.50 to 1.99ct G SI2 lab grown radiant diamonds typically cost $783 AUD to $2,349 AUD, with a median price of $1,094 AUD. There are currently 9 diamonds matching this specification available across retailers.

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

About 21% of these diamonds are available at multiple retailers, with an average price spread of 104%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct G SI2 Lab Grown Radiant

Quick answer

As of October 2026, there are 9 lab grown radiant diamonds with G colour and SI2 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $783 AUD to $2,349 AUD, with a median of $1,094 AUD. At least 21 retailers stock this exact specification, and 21% of the stones appear at more than one of them, with an average price spread of 104%. Half of all listings fall between $305 AUD and $834 AUD per carat. The same specification in natural form lists at a median of about $6,144 AUD per carat. Over the last 30 days the median price moved +6.3% and the number of listings moved +23.1%.

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: October 2026

Available

Lowest Price

$697 AUD

Highest Price

$3,239 AUD

Average Price

$1,338 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

20.8%

Price Spread

104.4%

30-Day Price Trend

+6.3%

30-Day Supply Change

+23.1%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$357/ct

10th Percentile

$150

Median

$357

90th Percentile

$731

Score Distribution

14 diamonds scored across 4 quality tiers

Excellent

1 (7.1%)

Very Good

3 (21.4%)

Good

3 (21.4%)

Average

7 (50.0%)

Find Your Diamond

Search 9 G SI2 radiant diamonds and compare prices.

Search Diamonds

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