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

As of November 6, 2026, 1.50 to 1.99ct K SI1 natural oval diamonds typically cost €1,989 EUR to €6,029 EUR, with a median price of €3,597 EUR. There are currently 526 diamonds matching this specification available across retailers.

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

About 43% of these diamonds are available at multiple retailers, with an average price spread of 67%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct K SI1 Natural Oval

Quick answer

As of November 6, 2026, there are 526 natural oval diamonds with K colour and SI1 clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run €1,989 EUR to €6,029 EUR, with a median of €3,597 EUR. Half of all listings fall between €1,592 EUR and €3,096 EUR per carat. The same specification in lab grown form lists at a median of about €544 EUR per carat. Over the last 30 days the median price moved -1.2% and the number of listings moved +9.6%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Oval natural stones in the index: 2,512 USD per carat, -7.2% month on month. See the full index release

Figures come from current listings across more than 125 retailers. The index is a monthly release.

Last updated: November 6, 2026

Available

526

Lowest Price

€1,440 EUR

Highest Price

€12,949 EUR

Average Price

€3,882 EUR