How much does a 5.00ct+ I SI1 lab grown oval diamond cost?

As of November 2026, 5.00ct+ I SI1 lab grown oval diamonds typically cost €2,003 EUR to €472,532 EUR, with a median price of €3,147 EUR. There are currently 1 diamonds matching this specification available across retailers.

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

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5.00ct+ I SI1 Lab Grown Oval

Quick answer

As of November 2026, there are 1 lab grown oval diamonds with I color and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run €2,003 EUR to €472,532 EUR, with a median of €3,147 EUR. The same specification in natural form lists at a median of about €16,689 EUR per carat.

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

15.05ct Oval I SI1, IGI, grade A, from €2,543 EUR

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: November 2026

Available

Lowest Price

€1,771 EUR

Highest Price

€673,438 EUR

Average Price

€170,376 EUR

Score Distribution

4 diamonds scored across 4 quality tiers

Excellent

1 (25.0%)

Very Good

1 (25.0%)

Good

1 (25.0%)

Average

1 (25.0%)

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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