How much does a 1.50 to 1.99ct I SI1 natural asscher diamond cost?

As of October 2026, 1.50 to 1.99ct I SI1 natural asscher diamonds typically cost $4,657 AUD to $11,821 AUD, with a median price of $7,710 AUD. There are currently 67 diamonds matching this specification available across retailers.

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

About 28% of these diamonds are available at multiple retailers, with an average price spread of 50%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I SI1 Natural Asscher

Quick answer

As of October 2026, there are 67 natural asscher diamonds with I colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run $4,657 AUD to $11,821 AUD, with a median of $7,710 AUD. At least 54 retailers stock this exact specification, and 28% of the stones appear at more than one of them, with an average price spread of 50%. Half of all listings fall between $4,284 AUD and $6,931 AUD per carat. The same specification in lab grown form lists at a median of about $1,289 AUD per carat. Over the last 30 days the median price moved -1.0% and the number of listings moved +11.8%.

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. Asscher natural stones in the index: 2,504 USD per carat, -3.3% 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

$3,244 AUD

Highest Price

$22,135 AUD

Average Price

$8,241 AUD