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

As of October 2026, 5.00ct+ I SI1 natural oval diamonds typically cost $73,916 CAD to $280,058 CAD, with a median price of $135,918 CAD. There are currently 40 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 Natural Oval

Quick answer

As of October 2026, there are 40 natural oval diamonds with I color and SI1 clarity in the 5.00ct+ range available across retailers worldwide. Prices typically run $73,916 CAD to $280,058 CAD, with a median of $135,918 CAD. The same specification in lab grown form lists at a median of about $645 CAD per carat.

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

Lowest Price

$54,599 CAD

Highest Price

$1,177,226 CAD

Average Price

$167,710 CAD

Score Distribution

105 diamonds scored across 4 quality tiers

Excellent

5 (4.8%)

Very Good

29 (27.6%)

Good

22 (21.0%)

Average

49 (46.7%)

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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