How much does a 0.75 to 0.99ct G SI1 lab grown oval diamond cost?

As of October 2026, 0.75 to 0.99ct G SI1 lab grown oval diamonds typically cost $608 AUD to $1,132 AUD, with a median price of $703 AUD. There are currently 31 diamonds matching this specification available across retailers.

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

About 17% of these diamonds are available at multiple retailers, with an average price spread of 102%. A comparison tool like Carat Hunter lets you see all the prices side by side.

0.75 to 0.99ct G SI1 Lab Grown Oval

Quick answer

As of October 2026, there are 31 lab grown oval diamonds with G colour and SI1 clarity in the 0.75 to 0.99ct range available across retailers worldwide. Prices typically run $608 AUD to $1,132 AUD, with a median of $703 AUD. At least 30 retailers stock this exact specification, and 17% of the stones appear at more than one of them, with an average price spread of 102%. Half of all listings fall between $476 AUD and $1,190 AUD per carat. The same specification in natural form lists at a median of about $2,970 AUD per carat. Over the last 30 days the median price moved -2.1% and the number of listings moved -14.8%.

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. Oval lab grown stones in the index: 453 USD per carat, -7.4% 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

$412 AUD

Highest Price

$3,435 AUD

Average Price

$837 AUD

Market Intelligence

Retailers Selling

Cross Retailer %

17.2%

Price Spread

102.2%

30-Day Price Trend

-2.1%

30-Day Supply Change

-14.8%

Volatility (30d)

0.02

Price Range

Price per carat distribution across retailers

$492/ct

10th Percentile

$180

Median

$492

90th Percentile

$1,339

Score Distribution

65 diamonds scored across 4 quality tiers

Excellent

2 (3.1%)

Very Good

7 (10.8%)

Good

27 (41.5%)

Average

29 (44.6%)

Find Your Diamond

Search 31 G SI1 oval 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