How much does a 1.50 to 1.99ct G SI1 natural oval diamond cost?

As of October 2026, 1.50 to 1.99ct G SI1 natural oval diamonds typically cost $8,629 AUD to $21,672 AUD, with a median price of $13,269 AUD. There are currently 391 diamonds matching this specification available across retailers.

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

About 30% of these diamonds are available at multiple retailers, with an average price spread of 40%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct G SI1 Natural Oval

Quick answer

As of October 2026, there are 391 natural oval diamonds with G colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $8,629 AUD to $21,672 AUD, with a median of $13,269 AUD. At least 64 retailers stock this exact specification, and 30% of the stones appear at more than one of them, with an average price spread of 40%. Half of all listings fall between $7,025 AUD and $10,423 AUD per carat. The same specification in lab grown form lists at a median of about $691 AUD per carat. Over the last 30 days the median price moved -2.3% and the number of listings moved +2.6%.

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 natural stones in the index: 2,655 USD per carat, +10.2% 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

391

Lowest Price

$3,737 AUD

Highest Price

$36,717 AUD

Average Price

$14,300 AUD